With age, the tissues making up a heart valve can lose flexibility and become stiff and narrowed while retaining their one-way closure properties. Suppose a man’s aortic valve is affected by this condition but his ventricles do not change their force of contraction. Which of the following will likely happen?

A. Blood will flow more rapidly than normal through the atria and right ventricle.

B. Pressure within the left ventricle will increase during the systole phase.

C. The body’s total blood volume will drop.

D. Volume of blood flowing out of the left ventricle during a contraction will increase.

Pressure within the left ventricle will increase during the systole phase.
How does blood pressure in the aorta change as the heart goes through a cardiac cycle, and why?

A. Blood pressure in the aorta increases during systole as the result of muscle contraction in the ventricles.

B. Blood pressure in the aorta increases during diastole as the result of increased blood volume in the ventricles.

C. Blood pressure in the aorta increases during systole as the result of increased blood volume in the ventricles.

D. Blood pressure in the aorta increases during diastole as the result of muscle contraction in the ventricles.

Blood pressure in the aorta increases during systole as the result of muscle contraction in the ventricles.
During the systole phase of the cardiac cycle, high blood pressure in the ventricles forces the

A. aortic valve to open.

B. atrioventricular valves to open.

C. pulmonary valve to close.

D. atria to contract.

aortic valve to open.
The cardiac cycle refers to the rhythmic relaxation (known as _______) and contraction (known as _______) of the _______.

A. diastole; systole; atria

B. diastole; systole; ventricles

C. systole; diastole; ventricles

D. systole; diastole; atria

diastole; systole; ventricles
x

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