Questions: Question 38 Isovolumentric relaxation occurs during: none of these early diastole late systole mid-to late diastole Question 39 The portion of the intrinsic conduction system located in the superior interventricular septum is the

Question 38:

The answer is: early diastole.

Explanation:

• Early diastole: Isovolumetric relaxation occurs during early diastole. This is the phase of the cardiac cycle when the ventricles relax after systole, and the pressure in the ventricles falls below that in the atria, leading to the closure of the semilunar valves and before the opening of the atrioventricular valves.
• Late systole: This is when the ventricles are still contracting, so isovolumetric relaxation does not occur here.
• Mid-to late diastole: By this time, the atrioventricular valves have opened, and the ventricles are filling with blood, so isovolumetric relaxation is not occurring.
• None of these: This option is incorrect because isovolumetric relaxation does occur during early diastole.

Question 39:

The answer is: the bundle of His.

Explanation:

• The bundle of His is the portion of the intrinsic conduction system located in the superior interventricular septum. It is responsible for conducting electrical impulses from the atrioventricular node to the ventricles, ensuring coordinated contraction.