Question

The wave of atrial depolarization is transported by a specialized conductive tissue that radiates from a small mass of muscle tissue called the _____.

Answer 1

The wave of atrial depolarization is conducted by a specialized conductive tissue that radiates from a small mass of muscle tissue called the sinoatrial (SA) node.

Step-by-step explanation:

The sinoatrial (SA) node, often referred to as the heart's natural pacemaker, is a small mass of muscle tissue located in the right atrium of the heart. It initiates the electrical impulses responsible for the contraction of the heart muscle. The wave of atrial depolarization, the electrical activity that triggers the contraction of the atria, originates from the SA node. From the SA node, the electrical signal travels through the atrial muscle fibers, stimulating them to contract and pump blood into the ventricles. This specialized conductive tissue ensures coordinated and efficient contraction of the heart chambers, maintaining the heart's rhythmic and pumping function.

Answer 2

The wave of atrial depolarization starts at the sinoatrial node (SA node) and spreads across the atria via specialized pathways like Bachmann's bundle, leading to contraction of the atrial myocardial cells and subsequent blood pumping into the ventricles.

Step-by-step explanation:

The wave of atrial depolarization is transported by a specialized conductive tissue that radiates from a small mass of muscle tissue called the sinoatrial node (SA node). This electrical impulse is crucial for initiating the rhythm of the heart and triggering muscular contraction. The impulse spreads from the SA node throughout the atria via specialized internodal pathways and Bachmann's bundle, also known as the interatrial band, which transmits the impulse directly from the SA node in the right atrium to the left atrium. This impulse causes the atrial myocardial contractile cells to contract, pumping blood efficiently into the ventricles.