Question

Which of the following heart tissues is known as the pacemaker?
(1) Sinoatrial node
(2) Atrioventricular node
(3) Purkinje fibres
(4) His bundle

Answer 1

The heart's walls include a network of specialised muscle cells. These muscle cells give signals to the rest of the heart muscle, which causes the heart muscle to contract. The cardiac conduction system is a collection of muscle cells. The SA node, AV node, HIS bundle, bundle branches, and Purkinje fibres are the primary components of the system.

Complete answer:
The sinoatrial node, also known as the SA node, is the heart's natural pacemaker. The impulse starts in the SA node, a small cluster of unique cells located in the right atrium.
The sino-atrial node (SA node) sends cardiac impulses to the atrio-ventricular node, which then sends them to the bundle of his. As a result, the SA node begins and maintains cardiac rhythmicity. As a result, it is referred to as the pacemaker.

Let's take a look at a signal as it goes through the contraction process. The SA node initiates the sequence by contracting the atrial muscles. That's why it's sometimes referred to as the anatomical pacemaker by doctors. The signal then passes through the AV node, the HIS bundle, the bundle branches, and the Purkinje fibres, causing the ventricles to contract. This signal causes an electrical current to flow, which can be observed on an electrocardiogram, or EKG, graph. An EKG is used by doctors to assess the efficiency of the cardiac conduction system. Any alterations in the EKG could indicate major issues.

In a healthy heart, the sinus node generates electrical impulses on a constant basis, maintaining the proper rhythm and pace. As a result, the SA node is known as the heart's natural pacemaker.

The correct answer is (1) sinoatrial node.

Note:
The sinoatrial node (also known as the sinoatrial node, SA node, or sinus node) is a collection of cells in the heart's right atrium wall. These cells can produce an electrical impulse (action potential; see below for more information) that travels through the electrical conduction system and causes the heart to contract. The SA node, also known as the heart's natural pacemaker, continuously produces action potentials in a healthy heart, setting the heart's rhythm.