The answer is d. Isovolumetric contraction.

Here's why:

a. Isovolumetric relaxation: This is the period when all four valves are closed and the ventricles are relaxed.

b. Atrial contraction: This is the final part of the diastole when the atria contract and push blood into the ventricles.

c. Ventricular ejection: This is the phase when the ventricles contract and push blood out of the heart.

d. Isovolumetric contraction: This is the initial phase of the ventricular contraction when ventricular pressure increases and AV valves close but pressure is not high enough to open semilunar valves.

e. Passive ventricular filling: This is the phase when the ventricles are relaxed and the blood flows into the ventricles passively.

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The answer is d. Isovolumetric contraction.

Here's why:

a. Isovolumetric relaxation: This is the period when all four valves are closed and the ventricles are relaxed.

b. Atrial contraction: This is the final part of the diastole when the atria contract and push blood into the ventricles.

c. Ventricular ejection: This is the phase when the ventricles contract and push blood out of the heart.

d. Isovolumetric contraction: This is the initial phase of the ventricular contraction when ventricular pressure increases and AV valves close but pressure is not high enough to open semilunar valves.

e. Passive ventricular filling: This is the phase when the ventricles are relaxed and the blood flows into the ventricles passively.

Knowee AI · Accepted Answer

The answer is d. Isovolumetric contraction.

Here's why:

a. Isovolumetric relaxation: This is the period when all four valves are closed and the ventricles are relaxed.

b. Atrial contraction: This is the final part of the diastole when the atria contract and push blood into the ventricles.

c. Ventricular ejection: This is the phase when the ventricles contract and push blood out of the heart.

d. Isovolumetric contraction: This is the initial phase of the ventricular contraction when ventricular pressure increases and AV valves close but pressure is not high enough to open semilunar valves.

e. Passive ventricular filling: This is the phase when the ventricles are relaxed and the blood flows into the ventricles passively.

The contraction of the ventricles begins, and ventricular pressure increases, closing the AV valvesQuestion 3Answera.Isovolumetric relaxationb.Atrial contractionc.Ventricular ejectiond.Isovolumetric contractione.Passive ventricular filling

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