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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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Regarding Nodal musculature of Heart - choose the incorrect statement :


( A ) AV Node is called the pacemaker
( B ) the number of action potentials that could be generated in a minute vary at different parts of the nodal system
( C ) nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable.
( D ) SA Node is responsible for initiating and maintaining the rhythmic contractile activity of the heart
Can you answer this question?
 
 

1 Answer

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(A) is the right answer.

The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable. However, the number of action potentials that could be generated in a minute vary at different parts of the nodal system. The SAN can generate the maximum number of action potentials, i.e., 70-75 minñ1, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker. Our heart normally beats 70-75 times in a minute (average 72 beats/min).
answered Apr 3, 2014 by pady_1
 
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