Questions: Multiple Select Question Select all that apply Which of the following are characteristics of the cardiac cycle? - When the atria contract, the ventricles relax. - It involves 1 complete contraction and relaxation of the atria and ventricles. - When the right atrium and ventricle contract, the left atrium and ventricle relax. - Exercise influences the cardiac cycle.

Multiple Select Question Select all that apply Which of the following are characteristics of the cardiac cycle? - When the atria contract, the ventricles relax. - It involves 1 complete contraction and relaxation of the atria and ventricles. - When the right atrium and ventricle contract, the left atrium and ventricle relax. - Exercise influences the cardiac cycle.
Transcript text: Multiple Select Question Select all that apply Which of the following are characteristics of the cardiac cycle? - When the atria contract, the ventricles relax. - It involves 1 complete contraction and relaxation of the atria and ventricles. - When the right atrium and ventricle contract, the left atrium and ventricle relax. - Exercise influences the cardiac cycle.
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Solution

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The answer is the first one: When the atria contract, the ventricles relax.

Explanation for each option:

  1. When the atria contract, the ventricles relax.

    • This is correct. During the cardiac cycle, the atria and ventricles work in a coordinated manner. When the atria contract (atrial systole), the ventricles are in a relaxed state (ventricular diastole) to allow blood to flow from the atria into the ventricles.

  2. It involves 1 complete contraction and relaxation of the atria and ventricles.

    • This is also correct. The cardiac cycle consists of one complete heartbeat, which includes one contraction (systole) and one relaxation (diastole) of both the atria and the ventricles.

  3. When the right atrium and ventricle contract, the left atrium and ventricle relax.

    • This is incorrect. Both the right and left atria contract simultaneously, followed by the simultaneous contraction of both the right and left ventricles. They do not contract and relax in opposition to each other.

  4. Exercise influences the cardiac cycle.

    • This is correct. Exercise increases the heart rate and the strength of cardiac contractions, thereby influencing the duration and dynamics of the cardiac cycle.

Summary: The characteristics of the cardiac cycle include the coordinated contraction and relaxation of the atria and ventricles, the involvement of one complete contraction and relaxation of the heart chambers, and the influence of exercise on the cycle. The statement about the right and left sides of the heart contracting and relaxing in opposition is incorrect.

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