ANATOMY

Detailed explanation-1: -The rate at which these impulses fire controls the rate of cardiac contraction, that is, the heart rate. The cells that create these rhythmic impulses, setting the pace for blood pumping, are called pacemaker cells, and they directly control the heart rate.

Detailed explanation-2: -The period of relaxation that occurs as the chambers fill with blood is called diastole. Both the atria and ventricles undergo systole and diastole, and it is essential that these components be carefully regulated and coordinated to ensure blood is pumped efficiently to the body.

Detailed explanation-3: -Contractile cells and pacemaker cells are important in the overall functioning of the heart. Contractile cells are involved in muscular contractions in the process of pumping blood, while pacemaker cells are involved in creating rhythmic impulses that set the pace for the heart during the blood pumping process.

Detailed explanation-4: -It’s a small mass of specialized cells in the top of the right atrium (upper chamber of the heart). It produces the electrical impulses that cause your heart to beat. A chamber of the heart contracts when an electrical impulse or signal moves across it.