Systole and Diastole Describe the Function of The

Question

Systole and diastole describe the function of the
A) pericardium.
B) SA node.
C) myocardium.
D) mediastinum.

Accepted Answer

Systole and diastole refer to the contraction and relaxation, respectively, of the myocardium (heart muscle). The pericardium is the protective sac surrounding the heart, the SA node is the pacemaker of the heart, and the mediastinum is the space in the chest containing the heart and other organs.