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  • Read the following statements and select the correct option. Statement 1 : The SA node acts as pacemaker. Statement 2 : The SA node is located

Read the following statements and select the correct option.

Statement 1 : The SA node acts as pacemaker.

Statement 2 : The SA node is located in the wall of the right atrium near the interatrial septum.

Option: 1

Both statements 1 and 2 are correct 


Option: 2

Statement 1 is correct but statement 2 is incorrect 


Option: 3

Statement 1 is incorrect but statement 2 is correct 


Option: 4

Both the statements 1 and 2 are incorrect


Answers (1)

best_answer

 

Function of nodal musculature -

The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable.

- wherein

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 min–1, 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–1).

 

 Correct option is 2

 

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