Which of the following statement/s is/are not true about cardiac output? A. During exercise, stroke volume increases as venous return increases and stretches the myocardium of the ventricles. B. During exercise, increase in stroke volume and the increase in pulse result in an increase in cardiac output. C. Cardiac reserve is the difference between resting cardiac output and the maximum cardiac output. D. The ejection fraction is the percent of its total blood that the atrium pumps per beat with an average of 60-70%. 2. The mechanisms that maintain venous return are the following, except? A. Constriction of veins with the valves preventing backflow of blood. B. Contraction of skeletal muscles, especially in the legs, squeezes the deep veins. C. The pressure changes of inhalation and exhalation expand and compress the veins in the chest cavity. D. All statements are correct. 3. Which of the following events occur during early ventricular systole? A. the atria are relaxed, the ventricles are filling passively, the atrioventricular valves are open B. the ventricles are starting to contract, the atrioventricular valves are closed, the semilunar valves are closed C. the atria contract, the ventricles are relaxed, the atrioventricular valves are open D. the atria are relaxed, the ventricles are starting to relax, the atrioventricular valves are opening, the semilunar valves are closing.
Multiple Choice. Answer the following questions.
1. Which of the following statement/s is/are not true about cardiac output?
A. During exercise, stroke volume increases as venous return increases and stretches the myocardium of the ventricles.
B. During exercise, increase in stroke volume and the increase in pulse result in an increase in cardiac output.
C. Cardiac reserve is the difference between resting cardiac output and the maximum cardiac output.
D. The ejection fraction is the percent of its total blood that the atrium pumps per beat with an average of 60-70%.
2. The mechanisms that maintain venous return are the following, except?
A. Constriction of veins with the valves preventing backflow of blood.
B. Contraction of skeletal muscles, especially in the legs, squeezes the deep veins.
C. The pressure changes of inhalation and exhalation expand and compress the veins in the chest cavity.
D. All statements are correct.
3. Which of the following events occur during early ventricular systole?
A. the atria are relaxed, the ventricles are filling passively, the atrioventricular valves are open
B. the ventricles are starting to contract, the atrioventricular valves are closed, the semilunar valves are closed
C. the atria contract, the ventricles are relaxed, the atrioventricular valves are open
D. the atria are relaxed, the ventricles are starting to relax, the atrioventricular valves are opening, the semilunar valves are closing.
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