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The pre-potential (resting potential) of pacemaker cells is produced by the opening of ________ at the...

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Medical Sciences

The pre-potential (resting potential) of pacemaker cells isproduced by the opening of ________ at the end of an actionpotential.

A. fast Ca2+ channels

B. slow Na+ channels

C. slow Ca2+ channels

D. K+ channels

Answer & Explanation Solved by verified expert
3.7 Ratings (467 Votes)
Pacemaker or autorhythmic cells account for a small minority of cells in the myocardium The rest 99 are contractile cells that are responsible for pumping the bloodPacemaker cells are concentrated at two nodes the sinoatrial node SA node located in the right atrium near the superior vena cava and the atrioventricular node AV node located at the base of the right atrium near the junction of the four heart chambers They are unique because they can spontaneously produce action potentials in rhythm to control the heart    See Answer
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