Which is the correct sequence of parts through which cardiac action potentials pass?

Purkinje fibres, AV node, SA node, bundle of His, atrial fibres

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AV node, atrial fibres, SA node, bundle of His, Purkinje fibres

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SA node, bundle of His, atrial fibres, AV node, Purkinje fibres

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SA node, atrial fibres, AV node, bundle of His, Purkinje fibres

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Solution

The correct option is D SA node, atrial fibres, AV node, bundle of His, Purkinje fibres
Signals arising in the SA node (located in the right atrium), stimulate the atria to contract and travel to the AV node, which is located in the interatrial septum via the atrial fibers. After a delay, the stimulus diverges and is conducted through the left and right bundle of His to the respective Purkinje fibers for each side of the heart, as well as to the endocardium at the apex of the heart, then finally to the ventricular epicardium.
So, the correct answer is option D.

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

Q. Mark the odd one in each of the following series:
Purkinje fibres, AV bundle, AV valve, SA node.

Q. Is there any other name that you can give for this set- " Purkinje fibres,A V node,S A node."

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?

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.

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