Multiple choice

During the cardiac cycle of a normal healthy adult, which of the following events takes place?

  1. During ventricular diastole, the pressure in the left ventricle of heart reaches upto the maximum value of 80 mm Hg.

  2. During ventricular systole, the pressure in the left ventricle of heart reaches up to a maximum value of about 120 mm Hg.

  3. The increase in the rate of pressure is determined by excitation-contraction coupling.

  4. During ventricular systole, the total blood present in the ventricles is ejected.
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D Correct answer
Explanation

It is just the reverse statement. During the time period between the closure of the AV valves and the opening of the aortic and pulmonic valves, ventricular pressure rises rapidly without a change in ventricular volume. Thus, no ejection of blood occurs.

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