Biology College

Nina studies an artificial heart model the model has tubes that supply electric current to the model compare this model with that of a human heart and place the steps describing how blood flows through the human heart in order

Answers

Answer 1

The correct order of the steps describing how blood flows through the human heart is as follows:

1. electrical signal travels toward the heart.

2. signal by the nodes in the atrium.

3. the atria contract.

4. signal received by the atrioventricular node.

5. signal transferred to the ventricles.

6. the ventricles contract.

The artificial heart model that Nina studies, which contracts and relaxes upon receiving an electric current, can be compared to the functioning of a human heart. However, it is important to note that the model described does not fully capture the complexity and intricacy of the human cardiovascular system.

In a human heart, the process of blood flow begins with the electrical signal generated by the sinoatrial (SA) node, located in the right atrium. This signal, often referred to as the natural pacemaker of the heart, initiates the heartbeat. From the SA node, the electrical signal travels through specialized conducting fibers known as internodal pathways, causing the atria to contract.

As the atria contract, blood is forced into the ventricles, filling them. The electrical signal then reaches the atrioventricular (AV) node, which is located between the atria and ventricles. The AV node briefly delays the signal, allowing the ventricles to fully fill with blood before contracting.

Once the signal is received by the AV node, it is conducted through the bundle of His, a collection of specialized fibers. As a result, the ventricles contract, pumping blood out of the heart.

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Nina studies an artificial heart model. The model has tubes that supply an electric current to the model. Nina switches on the current that provides an impulse to the heart. She observes that the heart contracts and relaxes. Compare this model with that of a human heart, and place the steps describing how blood flows through the human heart in order.

signal transferred to the ventricles

the atria contract

electrical signal travels toward the heart

the ventricles contract

signal by the nodes in the atrium

signal received by the atrioventricular node

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Related Questions

tRNA Molecules
Lys
Asn
Codons
mRNA
GGU
Anticodons
Cytoplasm
H.O Counter 0
HTT
5
3'
Ribosome
For each codon, find the correct tRNA anticodon and drag it to the ribosome. Start with the AUG codon
in the ribosome. Find and drag its match, the UAC anticodon, to it. Also, record this pair and the
associated amino acid, Met, to complete the first row of the data table.

Answers

The first codon in the ribosome is AUG, which codes for the amino acid methionine (Met). The anticodon for methionine is UAC. So, drag the UAC anticodon to the ribosome next to the AUG codon.

How to obtain codons?

Also record this pair and the associated amino acid, Met, in the data table. The data table would look like this:

Codon Anticodon Amino Acid

AUG UAC Met

Then continue to find the correct tRNA anticodons for the remaining codons in the mRNA molecule. The table would be complete when all of the codons have been paired with their corresponding anticodons and amino acids.

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How does computer work as a means of information and communication? Describe in brief.

Answers

Computers process input data using the central processing unit (CPU), store and retrieve information, and communicate through networks to exchange data and facilitate information sharing and communication.

Computers serve as powerful tools for information processing and communication. They operate based on the principles of input, processing, storage, and output.

Input: Users interact with computers by providing input through devices such as keyboards, mice, or touchscreens. This input can be in the form of text, numbers, commands, or even voice and gestures, depending on the hardware and software capabilities.

Processing: Once the input is received, the computer's central processing unit (CPU) performs calculations, executes instructions, and manipulates data. The CPU fetches instructions from memory, decodes them, and carries out the necessary operations.

Storage: Computers have various forms of storage to hold data, including primary memory (RAM) and secondary storage devices like hard drives or solid-state drives. Data and programs are stored in these devices for quick access and long-term retention.

Output: The processed information is presented to users through output devices such as monitors, printers, or speakers. This can be in the form of text, images, sounds, or other media, depending on the intended purpose.

Communication: Computers enable communication through networks. They can connect to the internet or local networks, allowing users to exchange information, access remote resources, send emails, browse websites, and participate in online communities.

Overall, computers function as efficient information processors and facilitators of communication, empowering individuals and organizations to access, manipulate, and share vast amounts of data across the globe.

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an ecosystem experiences a massive flood that washes away soil and kills organisms

Answers

Biotic and abiotic factors were affected by the disturbance, but over time, the ecosystem may be able to return to stability.Option D

What is true?

In this case, the large flood had an impact on both biotic (living species) and abiotic (non-living forces). The flood destroyed soil and killed creatures, demonstrating its effects on the ecosystem's biotic and abiotic components. Even after large perturbations, ecosystems have the capacity to recover and regain their equilibrium over time.

The gradual repair and restoration of the ecosystem can be brought about by natural processes like succession, when new creatures colonize and repopulate the area. The environment has a chance to recover and reestablish stability, however it might take some time to do so.

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Missing parts

An ecosystem experiences a massive flood that washes away soil and kills organisms.

Which statement is true

A. Only abiotic factors were affected by this disturbance, and over -time, the ecosystem may be able to return to stability.

OB. Biotic and abiotic factors were affected by the disturbance, and

the ecosystem can never return to stability

OC. Only biotic factors were affected by the disturbance, and over time, a new type of ecosystem may develop.

D. Biotic and abiotic factors were affected by the disturbance, but over time, the ecosystem may be able to return to stability.

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