Which of the following indicates that the heart is in a state of relaxation?

The indication that the heart is in a state of relaxation is associated with diastolic pressure. During diastole, the heart muscles relax, allowing the chambers of the heart to fill with blood from the body and lungs. This phase follows systole, when the heart contracts and pumps blood out of the heart.

Diastolic pressure is specifically defined as the pressure within the arteries when the heart is at rest between beats, signifying a critical aspect of the cardiac cycle. It is measured when the heart's ventricles are relaxed and allows medical professionals to assess the heart's ability to fill adequately with blood.

In contrast, systolic pressure refers to the pressure in the arteries during the contraction of the heart muscle, directly related to the heart’s pumping action rather than its resting state. Mean arterial pressure is the average pressure within the arteries across one complete cardiac cycle, while pulsatile pressure refers to the variation in pressure during the heart's contraction and relaxation phases.