2. If total peripheral resistance __________, the flow rate through the systemic

Question

2. If total peripheral resistance __________, the flow rate through the systemic vessels __________.

increases/increases

increases/decreases

decreases/increases

decreases/decreases

increases/decreases or decreases/increases

3. The AV valves and semilunar valves must both be closed during

A. ventricular filling

ventricular ejection

isovolumic ventricular contraction

isovolumic ventricular relaxation

isovolumic ventricular contraction and relaxation

4. An increase in the heart rate, while the cardiac output remains constant, would

decrease the stroke volume output.

increase the stroke volume output.

have no effect on stroke volume output.

5. Which event marks the beginning of ventricular filling?

T wave

opening of the AV valves

closure of the semilunar valve

P wave

opening of the semilunar valve

increases/increases

increases/decreases

decreases/increases

decreases/decreases

increases/decreases or decreases/increases

Explanation / Answer

If total peripheral resistance increases/decreased then the rate of flow of blood through the systemic vessels increase/decrease. Both atrioventricular and the semilunar valves must be closed during the isovulumetric ventricular contraction and relaxation. If the heart rate increases and the cardiac output remains constant then, the stroke volume must decrease in order to compensate the effect. The P wave represents the ventricular diastole which marks the filling of the ventricles.

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