Bio question about heart??

Question

What is the primary peacemaker of the heart??

Answer 1

It is the sino-atrial node.

Answer 2

Do you mean 'pacemaker'?

If so, it's the sinus node.

Answer 3

Do you mean "pacemaker," as in what controls the beat of the heart? If so, then here's some info from the website listed below.

The stimulus that maintains this rhythm is self-contained. Embedded in the wall of the right atrium is a mass of specialized heart tissue called the sino-atrial (S-A) node. The S-A node is also called the pacemaker because it establishes the basic frequency at which the heart beats.

The interior of the fibers of heart muscle, like all cells, is negatively charged with respect to the exterior. In the cells of the pacemaker, this charge breaks down spontaneously about 70 times each minute. This, in turn, initiates a similar discharge of the nearby muscle fibers of the atrium. A tiny wave of current sweeps over the atria, causing them to contract.

Link to the properties of heart muscle

When this current reaches the region of insulating connective tissue between the atria and the ventricles, it is picked up by the A-V node (atrio-ventricular node). This leads to a system of branching fibers that carries the current to all parts of the ventricles.

The contraction of the heart in response to this electrical activity creates systole.

A period of recovery follows called diastole.

The heart muscle and S-A node become recharged.

The heart muscle relaxes.

The atria refill.

Answer 4

The Colt 45 is the primary PEACEmaker. The

SinoAtrial Node is the primary PACEmaker.