The sequence of action potential propagation through the heart is _______

Sinoatrial node, atrioventricular node, atrioventricular bundle, bundle of his, Purkinje fibers.

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Atrioventricular node, sinoatrial node, atrioventricular bundle, bundle of his, Purkinje fibers.

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Atrioventricular bundle, atrioventricular node, sinoatrial node, bundle of his, Purkinje fibers.

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Purkinje fibers, atrioventricular bundle, atrioventricular node, sinoatrial node, bundle of his.

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Solution

The correct option is A
Sinoatrial node, atrioventricular node, atrioventricular bundle, bundle of his, Purkinje fibers.

The cardiac conduction system is a group of specialized cardiac muscle cells in the walls of the heart that receive and send signals to the heart muscle causing it to contract. The main components of the cardiac conduction system are the SA node, AV node, bundle of His, bundle branches, and Purkinje fibers. The SA node (physiologicalpacemaker) starts the sequence by generating an electrical impulse, causing the atrial muscles to contract. From there, the signal travels to the AV node, then through the bundle of His, down the bundle branches, and through the Purkinje fibers, causing the ventricles to contract.

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The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is
$\begin{matrix} (a) & S A N o d e & A V N o d e & P u r k i n j e f i b e r & A V B u n d l e (b) & S A N o d e & P u r k i n j e f i b e r & A V N o d e & A V B u n d l e (c) & S A N o d e & A V N o d e & A V B u n d l e & P u r k i n j e f i b e r (d) & S A N o d e & P u r k i n j e f i b e r & A V B u n d l e & A V N o d e \end{matrix}$

Give these structure of the conduction system of the heart :
1. It is Atrioventricular bundle
2. AV node
3. Bundle branches
4. Purkinje fibres

5. SA node
Choose the arrangement that lists the structures in an order of an action potential passes through them.

Q. Go through the statements
Statement (I): The AV node and the bundle of His constitute the only electrical link between the atria and the ventricles.
Statement (II): The Bundle of His is a bundle of electrical nodes which allow the ventricles to contract.
Statement (III): The bundle of His is a group of fibres that carry electrical impulses through the centre of the heart
Statement (IV) : The bundle of His is located in the proximal intraventricular septum
How many of the above statements are correct?

Define the following terms and give their location?

(i) Purkinje fibre

(ii) Bundle of His

Q. The purpose of the AV node is to _______ and the purpose of the Purkinje fibers is to _______.

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