Rate of heart beat is determined by

Purkinje fibres

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Papillary muscles

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SA node

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AV node

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Solution

The correct option is C SA node
The sinoatrial node (SA) node, present in upper posterior wall of right atrium, serves as pacemaker as it's rate of impulse generation is hightest (0.85/second) and determines the rate and rhythm of heartbeat. Atrio Ventricular Node (AVN) is a nodal tissue that regulates the heart beat and is present in base of right atrium adjacent to interatrial septum. It produces impulse at rate of 0.45/second which is lower than that of SA node and hence, it is not considered as pacemaker.

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

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

Q. How is the rate of heart beat determined from the ECG?

Q. Assertion :An artificial pacemaker can replace the sinoatrial node of heart. Reason: An artificial pacemaker is capable of stimulating the heart electrically to maintain its beats.

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