What is the role of gap junctions in cardiac muscle function?
AAre not found in cardiac muscles
BAre not found in smooth muscles
CHave no significant role in cardiac muscle function
DFacilitate impulse transmission between cardiac myocytes
If the contractility of the heart is decreased, which of the following is seen ?
AIncreased ejection fraction
BIncreased stroke work
CDecreased stroke volume
DIncreased cardiac output
Which of the following structures in the heart are known for their rapid conduction of electrical impulses?
ASinoatrial (SA) node
BAtrioventricular (AV) node
CHis bundle
DPurkinje fibers
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