'Heart of heart' is (a) SA node (b) AV node (c) Bundle of HIS (d) Purkinje fibres

Name: Problem 67, Chapter 18: Objective Biology for NEET
Uploaded: 2021-11-08T07:09:31-08:00
Duration: 2 min 3 s
Channel: Qudsiya Anis
Description: 'Heart of heart' is (a) SA node (b) AV node (c) Bundle of HIS (d) Purkinje fibres

step 1 question you have been asked that which of the given four structures are referred to the heart o

'Heart of heart' is (a) SA node (b) AV node (c) Bundle of...

Key Concepts

Sinoatrial Node

The sinoatrial (SA) node is the primary pacemaker of the heart. It is responsible for initiating the electrical impulses that set the rhythm of the heartbeat by generating spontaneous action potentials. This node is crucial in maintaining the regular rhythm and rate of cardiac contractions, making it a central component in the heart’s conduction system.

Atrioventricular Node

The atrioventricular (AV) node serves as an important electrical relay station between the atria and the ventricles. It receives the impulse from the SA node via the atria and introduces a slight delay, ensuring that the atria have time to contract and properly fill the ventricles before the ventricles themselves contract.

Bundle of HIS

The Bundle of HIS, or the atrioventricular bundle, is a collection of heart muscle cells specialized for electrical conduction. It transmits the electrical impulses from the AV node down to the ventricular conduction pathways. This system is critical for coordinating the contraction of the ventricles in a timely and sequential manner.

Purkinje Fibres

The Purkinje fibres are an extensive network of specialized conducting fibers located in the inner ventricular walls. They rapidly distribute electrical impulses throughout the ventricles, ensuring a synchronized and efficient contraction of the ventricular myocardium, which is essential for effective blood pumping.

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