What are muscle fibres made of?

Answers

Answer 1

According to the research, muscle fibers can produce contraction and are made of myofibrils.

What are the muscle fibers?

They are the fibers that are located inside the muscle, which in turn are composed of sarcolemma, mitochondria, myofibrils, nucleus and sarcoplasmic reticulum.

The myofibrils are responsible for giving it the elastic characteristic and are made up of actin and myosin that fulfill the function of generating the contraction process.

Therefore, we can conclude that according to the research, muscle fibers can produce contraction and are made of myofibrils.

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Related Questions

Robert Hooke first observed cork under a microscope in jail so he named the small cubicles cells

False True

Answers

Robert Hooke first observed cork under a microscope in jail so he named the small cubicles cells is False.

Though "Robert Hooke" was the first person to observe cork under a microscope. He named the small cubicles cells because it used to remind him of the cells in the monastery

What is Robert Hook's discovery?Discovered microscopeDiscovering cells while observing a piece of cork under a microscopeRobert hook is considered the father of cell theoryHe found cell is a small structure and due to his discovery others were able to study more about the cell and explained that the cell is the basic unit of life.

Thus, the answer is false.

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Explain the propagation of electrical impulses along a neuron including the role of myelin

Answers

Nerve impulses are signals that are transmitted along nerve fibers of the body.

Nerve impulses are electrical impulses. They are generated in response to stimuli.

These electrical impulses create:

action potentials as waves of depolarization that moves along the axons.

The axons contain voltage-gated ion channels that are either opened or closed by depolarization (which is the opening of ion channels leading to changes in membrane potential)

Depolarization further causes other channels to open and close thus spreading across the entire length of the axon and into another nerve cell (neuron).

Myelin sheaths act as buffers and through salt conduction help increase the speed of electrical impulses through the neurons. Not every nerve cell is insulated with a myelin sheath.

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explain how RNA can serve as hereditary information​

Answers

Answer: Genetic code (genes and genome) and the mechanisms of replication.RNA determines a cell’s function, synthesizing proteins and enzymes. Mutations, changes in DNA instructions, are the molecular basis of evolution. Nucleic Acids are the basis for the storage and transmissions of hereditary information in all cells.

Explanation:

RNA serves as the hereditary information for viruses that lack DNA. Although, typically single-stranded in most cells, in viruses they can be either single-stranded or double-stranded. Double-stranded RNA is an indicator or a viral infection.

The ____ builds an important barrier against pathogens, but it has to absorb ___ efficiently at the same time.

Answers

The small intestine builds an important barrier against pathogens, but it has to absorb nutrients efficiently at the same time for optimum function.

What is a pathogen?

A pathogen refers to living microorganisms that are capable of causing diseases and harm to their host. Thus, they include the following:

ProtozoaFungiWormsVirusBacteria

Basically, the small intestine has the ability to build an important barrier against pathogens. However, it has to absorb nutrients efficiently at the same time for optimum function of an organism.

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Cod fry often settle under the bell of some jellyfish species, whose tentacles are poisonous. Name the form of relationship illustrated by this example. Assume the mechanism of formation of this device

Answers

Answer:

Explanation:

해파리 (cnidarians) have a worldwide distribution. Despite most being harmless, some species may cause local and also systemic reactions. 처치 of 해파리 envenomation is directed at: alleviating the local effects of venom, preventing further nematocyst discharges and controlling systemic reactions, including shock. In severe cases, the most important step is stabilizing and maintaining vital functions. With some 차이점 between species, there seems to be evidence and consensus on oral/topical analgesics, hot water and ice packs as effective painkillers and on 30 s application of domestic vinegar (4%–6% acetic acid) to prevent further discharge of unfired nematocysts remaining on the skin. Conversely, alcohol, methylated spirits and fresh water should be 조심스럽게 avoided, since they could massively discharge nematocysts; pressure immobilization bandaging should also be avoided, as laboratory studies show that it stimulates additional venom discharge from nematocysts. Most 처치 approaches are presently founded on 상대적으로 weak evidence; therefore, further research (especially randomized clinical trials) is strongly recommended. Dissemination of appropriate 처치 modalities should be deployed to better inform and educate those at risk. Adequate signage should be placed at 바닷가 to notify tourists of the jellyfish risk. Swimmers in risky areas should wear 보호 장비.

Which observation helped scientists determine the age of the universe?
A. All stars and galaxies are moving closer together at the same rate.
B. All stars and galaxies are moving away from Earth at the same
rate.
OC. The farther away a star or galaxy is, the more slowly it is moving
away from us.
о D. The farther away a star or galaxy is, the more quickly it is moving
away from us.

Answers

A. all stars and galaxies are moving closer together at the same rate

How many nuclei do neutrophils have?

Answers

Neutrophils have only one nucleus with between two to five lobes present in its cells.

What is a Neutrophil?

These are granulocytes and comprise of majority of the white blood cells found in the body.

They however have only one nucleus but are multi lobed in their structural composition thereby making it the most appropriate choice.

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How does the dna rate of travel differ for small dna fragments and large dna fragments?.

Answers

Answer:

Small fragments travel farther than large fragments. A high voltage rate will cause the DNA fragments to move slowly across the gel

What is the advantage of starting with the 4x objective before moving to the 10x and then the 40x objective?.

Answers

The advantage of starting with the 4x objective before moving to the 10x and then the 40x objective is that the lower power objective has a larger field of view and is easier to focus.

What are objective lens of a microscope?

An objective lens of a microscope are those lens that are used to focus that sample on a slide and they are always the closest lens to the slides.

The four types of objective lens of a microscope include:

× 4 objective

×10 objective

×40 objective and

oil immersion

The advantage of starting with the 4x objective before moving to the 10x and then the 40x objective is that the lower power objective has a larger field of view and is easier to focus.

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your instructor gives you an unknown organ for you to examine and identify through microscopy. what should you do first with the sample?

Answers

When examining an unknown organ and identifying it through microscopy, it is required fix it with preservative.

What is a preservative?

A preservative is a specific chemical compound used to conserve a biological sample.

In microscopy, preservatives are very useful to study the anatomy of body parts and their cells.

In conclusion, when examining an unknown organ and identifying it through microscopy, it is required fix it with preservative.

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what kind of characteristic is used innthe key to classify the animals???​

Answers

Answer:

the animal classification system anatomy morphology evaluational history features of embryological development and genetical makeup this classification stream is constantly deplobin as new information about specialitie hope it's helpful

Answer:

their anatomy, morphology, evolutionary history, features of embryological development, and genetic makeup.

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Explanation:

Determine which type(s) of blood this patient can safely receive. Check all that apply. A B AB O Also, the patient should receive blood that is for Rh.

Answers

People who are AB can receive blood from all types of blood groups.

What is Blood group?

This is the classification of blood based on polymorphisms in antigens on the surfaces of the red blood cells.

There are four types of blood groups and the AB is known as universal recipient which means it can receive blood from any of them. Also the patient should receive blood that is positive for Rh as it will not make anti-Rh antibodies which may destroy cells of the fetus.

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Answer: B and O........ Also, the patient can recieve blood that is NEGATIVE (only)

Explanation: these are the correct options on edge, i hope this helps!! :D

Help please help! Need help

Answers

Answer:

option c. 1 is correct.

*For detailed explanation refer to the attachment.

what are pollination and fertilization?​

Answers

Pollination is the transfer of pollen grains from an anther to a stigma. Pollen can be transferred by an animal or by the wind. Fertilisation takes place inside the ovary when the nucleus of pollen grain fuses with the nucleus of an ovule to produce a zygote.

Fertilization occurs when pollen grains (male gametophytes) are carried by the wind to the open end of an ovule, which contains the eggs, or female gametophyte. There, the pollen grain develops an outgrowth called a pollen tube, which eventually penetrates to the egg cell within one of the archegonia.

how is ""maximum"" tension achieved in a whole muscle (assuming optimal length)?

Answers

The maximum tension achieved in a whole muscle by stretching a muscle to its optimum length.

What is maximum tension of a muscle?

The maximum tension of a muscle is the maximum force that a muscle can generate when contacting.

The maximum tension equates to the maximum work that a contracting muscle can do.

The maximum tension achieved in a whole muscle by stretching a muscle to its optimum length where actin–myosin interactions are maximal.

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I need the answer asap

Answers

Answer:

Executive

Explanation:

having the power to put plans, actions, or laws into effect.

In part of the model, materials move out of the bag and into the water. which
of the following cell processes does this best model?
a. substances move from an area of low concentration to an area of
high concentration.
b. small molecules easily pass between the phospholipids in the cell
membrane.
c. transport proteins use energy to push large molecules across the
cell membrane.
o d. a vacuole opens to release substances into the area outside the
cell.
previous

Answers

Answer:

small molecules easily pass through the phospholipids in the cell membrane

Which structure is found only in plant cells and
functions in the process of photosynthesis?

a) W
b) X
c) Y
d) Z

Thank you.

Answers

Chloroplasts are the cells I plants that carry out the process of photosynthesis.

Answer:

B) Chloroplast

Explanation:

Chloroplasts are the organelle of photosynthesis. They make and store pigments that give petals and fruit their orange and yellow colours.

I hope this helps and have a good day!

This functional group consists of phosphorous bonded to three oxygens and double-bonded to one oxygen. Which functional group is shown in this image? O=P OT O This functional group consists of phosphorous bonded to three oxygens and double - bonded to one oxygen . Which functional group is shown in this image ? O = P OT O​

Answers

The biomolecule which  consists a functional group in which phosphorous bonded to three oxygens and double-bonded to one oxygen is Adenylic acid.

Adenylic acid is a nucleotide.

A nucleotide has three chemically distinct components.

One is a heterocyclic compound, the second is a monosaccharide and the third a phosphoric acid or phosphate unit.

It is a building block for a nucleic acid.

the heterocyclic compounds in nucleic acids are the nitrogenous bases named adenine, guanine, uracil, cytosine, and thymine. Adenine and Guanine are substituted purines while the rest are substituted pyrimidines. The skeletal heterocyclic ring is called as purine and pyrimidine respectively. The sugar found in polynucleotides is either ribose (a monosaccharide pentose) or 2' deoxyribose. A nucleic acid containing deoxyribose is called deoxyribonucleic acid (DNA) while that which contains ribose is called ribonucleic acid (RNA).

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Cartilage is separated from surrounding tissues by a fibrous.

Answers

Cartilage is separated from surrounding tissues by a perichondrium.

What separated the cartilage from the tissue?

Cartilage is separated from the surrounding tissues by perichondrium. It consist of two layers i.e. Outer Fibrous Layer that provides protection, mechanical support. It also attaches the cartilage to other structures.

So we can conclude that Cartilage is separated from surrounding tissues by a perichondrium.

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According to the research, cartilage is separated from surrounding tissues by a fibrous perichondrium.

What is a cartilage?

It is a specialized connective tissue that is devoid of nerves, blood vessels and lymphatic vessels.

These tissues allow the joints to move, protect the ends of the bones and act as a support against possible blows.

Therefore, we can conclude that according to the research, cartilage is separated from surrounding tissues by a fibrous perichondrium.

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Which statement is correct?
O Theories are accepted as true when a single experiment yields similar results to another one.
O When a scientist finds a new way to test a hypothesis, experimental methods do not change.
O Theories may be revised over time as information is discovered or technology is developed.
O When a scientist finds a new way to test a hypothesis, the original theory is made into a law.

Answers

Answer:

Theories may be revised over time as information is discovered or technology is developed.

Explanation:

A scientific theory is a term used when a statement tries to explain a natural phenomenon of nature based on scientific facts. In short, a theory is the representation of a set of hypotheses that was confirmed through an experiment and that tries to explain a phenomenon, but leaves room for revisions and updates to its explanation.

For this reason, we can say that theories are reformulated, revised and even discredited, when the advancement of scientific knowledge and technology allows the creation of new studies that show a different explanation and more consistent with reality.

Answer:C

Explanation:

Which of the following organic compounds is the main fuel supply for cellular work?
a. sugars
b. lipids
c. nucleic acids
d. proteins
I am pretty sure it's sugars but I want to check

Answers

I’m also pretty sure it’s sugar
Sugars are the organic compounds which help in cellular work.

Land heats and cools more than water because ________.

Answers

Land heats and cools more because it has a lower specific heat capacity that water.

To answer the question, we need to know what heat is

What is heat?

This is the amount of thermal energy in a body

What is specific heat capacity?

This is the amount of heat required to raise 1 kg of substance by 1 °C.

So, the greater the specific heat capacity, the greater he amount of heat required.

Since land which has a specific heat capacity of less than 1 J/g-°C and water which has a specific heat capacity of 4.2 J/g-°C, thus, land heats and cools more because it has a lower specific heat capacity that water.

So, land heats and cools more because it has a lower specific heat capacity that water.

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During appositional growth of cartilage, the cells that produce the matrix are the:

Answers

During the appositional growth of cartilage, the cells that produce the matrix are the chondroblasts.

What are chondroblasts?

Chondroblasts are a type of specialized cell found in bone tissues that help with its growth.

Appositional growth is a special type of growth in the bones where the medulla cavity undergoes reabsorption.

In conclusion, during the appositional growth of cartilage, the cells that produce the matrix are the chondroblasts.

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A camel has a hump to store water so it can survive in its desert environment. Which kind of adaptation is this?
A camel’s hump is an example of
adaptation.

Answers

Answer:

Camels actually store FAT and not water in their hump. This is called structural adaption.

Explanation:

Camels’ unique physiology and adaptations allow them to survive, even in the harshest conditions of the desert. Camels have thick fur to protect them from the heat, fat hump to serve as food storage, they rarely sweat, and can go for weeks without water. These are only a few reasons how camels survive in the desert, even without water.

Hope this helps you!

for each phenotype, list the genotypes (Remember to use the letter of the dominant trait)
* Straight hair is dominant to curly:
_____Straight
_____Straight
_____Curly
*Tail spikes are dominant to plain tails:
_____pointed
_____pointed
_____round​

Answers

Straight- Ss
Straight- SS
Curly- ss
Pointed- PP
Pointed- Pp
Round- pp

I need help. The four main types of macromolecules found in organisms are carbohydrates, lipids, nucleic acids, and ?

Answers

Answer:

Proteins

Explanation:

These are the carbohydrates, lipids (or fats), proteins, and nucleic acids. All of the major macromolecule classes are similar, in that, they are large polymers that are assembled from small repeating monomer subunits.

Which of the following represents a polar covalent compound?
H₂O
Cl₂
O2
NaCl

Answers

Answer:

NaCl

Explanation:

Indicate the relationship between the two items listed in each situation: (can be used more than once or not at all) - A. Resting neuron's permeability to K B. Resting neuron's permeability to Na - A. Neuron's permeability to Na during the rising phase of an action potential B. Neuron's permeability to K during the rising phase of an action potential - A. Resting neuron's permeability to Na B. Neuron's permeability to Na during the rising phase of an action potential - A. Resting neuron's permeability to K B. Neuron's permeability to K during the falling phase of an action potential - A. Neuron's permeability to Na during the falling phase of an action potential B. Neuron's permeability to K during the falling phase of an action potential a. A and B are equal. b. A is greater than B. c. B is greater than A.

Answers

The permeability of the neuron membrane to Na and K differs with the stages of action potential as follows:

A is greater than BA is greater than BB is greater than A

What is an action potential?

An action potential is a sudden change in the voltage across the membrane of a resting neuron resulting in transmission of impulse.

An action potential results in variation of neuronal membrane to sodium and potassium ions.

A. Resting neuron's permeability to K >>>  B. Resting neuron's permeability to Na

Thus, A is greater than B.

A. Neuron's permeability to Na during the rising phase of an action potential >>> B. Neuron's permeability to K during the rising phase of an action potential.

Thus,  A is greater than B.

A. Neuron's permeability to Na during the falling phase of an action potential  <<< B. Neuron's permeability to K during the falling phase of an action potential.

B is greater than A.

Therefore, the permeability of the neuron membrane to Na and K differs with the stages of action potential.

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What were the two achievements of the first women’s rights convention at Seneca Falls?

Answers

The women’s rights convention at Seneca Falls was the first largest convocation of women of its kind in the United States of America.

What is the women convention?

The women convention was the first largest convocation of women of its kind in the United States of America. The subject of discussion was the right of women.

The two main achievements of the convocation were;

1) The launching of the  women's suffrage movement

2) The fact that women were later allowed to vote

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A laptop costs 600Students get a 5% discount.How much discount will a student get? After the aed delivers a shock, what is your next step? begin cpr compressions deliver another shock do nothing remove the aed pads Need help please answer!!! Which of these do scientists change when new evidence conflicts with oldideas?A. Experimental variablesB. Experimental resultsOC. Scientific methodsOD. Scientific theories Which point is on the graph of f(x) = 3.4x Which team dysfunction does safe help address with the help of business owners After reading The Nose, what is one assumption that a reader might make about Russian culture? Read this paragraph from The Dark Game.It may seem surprising that no Confederate sympathizers took action against Van Lew, given her strong and public views on secession and slavery. Surely there were suspicions, especially among her upper-crust neighbors, but the matter never went beyond those suspicions. Historians have suggested that the secessionists were victims of their own cultural bias, believing that no aristocratic person, and certainly not a lady, would ever consider taking part in anything as impolite as spying. A true lady managed her servants, prepared parties and gatherings, and blindly supported her husband. Such attitudes worked in Van Lew's favor, diverting suspicion from her.What central idea is implied in this paragraph?Elizabeth Van Lew did not follow the rules society set forth for ladies of her time and social class.Elizabeth Van Lew was a successful spy because society did not expect a lady to serve in that role.Elizabeth Van Lew was able to disguise her spying activities because she kept her views about the war to herself.Elizabeth Van Lew created for herself an untrue but believable cover story: she was a wealthy lady living in a fancy neighborhood. When would a pie chart be an effective visualization? what type of forces that created at shaping machine A flatter, more horizontal demand or supply curve ____A. Is elastic B. Is inelasticC. Has zero elasticity D. Has price in elasticity Which if the following rules best describes the matrix below?a.dilation of scale factor 2c. reflection over the line y = xb. reflection over the y-axisd. translation 1 unit left and 1 unit up 120 is the product of 8 and Julie's score. Which of them factored 12x^7 correctly? Which image does Walt Whitman create by repeating language in I Hear America Singing?an image of people who are bored with their workan image of people who are united in their joyan image of people who are putting on a concert an image of people who are competing for attention _____ is a guaranteed line of credit in which a bank makes a binding commitment to provide a business with funds up to a specified credit limit at any time during the term of the agreement. Given: T V; ST || UVProve: TU || VW4 connected lines are shown. A line from point S goes slightly down and to the left to point T to form S T. A line from point T goes slightly down and to the right to point U to form T U. A line from point U goes slightly down and to the left to point V to form U T. A line goes slightly down and to the right to point W to form point W.Complete the two-column proof.edge 2022 pls helpppppp During which period would you be MOST likely to see organic methods used such as using manure as fertilizer?A. The Green RevolutionB. before the Neolithic RevolutionC. Second Agricultural RevolutionD. today 1.she doesn't have any tablet->she wishes she2.He has got notbody to play with->He wishes he3.we must study this summer ->We whish we 4.They cannot dance ->They wish they 5.It would be better if you stopped smoking ->It's time 6.i'd prefer it if you didn't make noise ->I'd rather7.you are always running about ->we wish you8.the cat is alway scratching the window->I wish the window9.you are sining a boring song-> I wish the song10.we are living in a bad neighborhood->we wish the neighborhood In a market survey, 100 traders sell fruits, 40 sell apples, 46 oranges, 50 mangoes. 14 apples and oranges. 15 apples and mangoes, and 10 sell the three fruits. Each of the 100 traders sells at least one of the three fruits. Find the number that sell oranges and mangoes only.