Match the following terms describing electrical events with the correct phases o

Question

Match the following terms describing electrical events with the correct phases of the cardiac cycle.

The ventricular muscle cells depolarize at the start of this phase.

During this phase, Na+ entry through the funny channels causes the pacemaker potential of SA nodal cells to gradually become less negative until it reaches threshold.

The ventricular muscle cells repolarize right before this phase.

The cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase.

isovolumetric contraction

ventricular ejection

ventricular filling

isovolumetric relaxation

Match the following terms describing electrical events with the correct phases of the cardiac cycle.

Question Selected Match

The ventricular muscle cells depolarize at the start of this phase.

During this phase, Na+ entry through the funny channels causes the pacemaker potential of SA nodal cells to gradually become less negative until it reaches threshold.

The ventricular muscle cells repolarize right before this phase.

The cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase.

All Answer Choices A.

isovolumetric contraction

B.

ventricular ejection

C.

ventricular filling

D.

isovolumetric relaxation

Explanation / Answer

The ventricular muscle cells depolarize at the start of this phase. A.isovolumetric contraction During this phase, Na+ entry through the funny channels causes the pacemaker potential of SA nodal cells to gradually become less negative until it reaches threshold. C.ventricular filling The ventricular muscle cells repolarize right before this phase. D.isovolumetric relaxation The cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. B.ventricular ejection

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