Q.

Regarding the conduction system of the heart:

A. the right bundle branch (of HIS) divides into anterior and posterior fasicles
B. the AV node contains P cells
C. myocardial fibres have a resting membrane potential of -60mV
D. action potential in the SA and AV nodes are largely due to Na+ influx
E. there are two types of K+ channels in pacemaker tissue – transient and long acting
Answer» B. the AV node contains P cells
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