Homework Answers
Answer :- True
Types of cardiac muscle cells :-
1) autorhythmic cells :- exhibits pacemaker potential.
1%of total cardiac cells.
Mainly present in SA node.
Contains M2 receptor binding to Ach.
Here depolarisation is due inward diffusion of Ca2+ ions.
Repolarization is due outward diffusion of K+
Parasympathetic branch acts on this cells and slows down the conduction i.e decreases the heart rate.
2)contractile cells:- 99%of muscle cells.
Depolarisation is rapid due to inward diffusion of sodium.
Parasympathetic branches have little effect over it.
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