Inset (a) shows the heart’s electrical conduction pathway, starting at the Sinoatrial node (SA node). The SA node is the heart’s primary pacemaker, and it produces action potentials that cause the heart to beat. Inset (b) shows the action potential of the pacemaker cells in the SA node. Choose the correct answer(s).

Question

Accepted Answer

The heart's electrical conduction pathway begins at the sinoatrial (SA) node and finishes with the Purkinje fibers.

Accepted Answer

Pacemaker cells in the SA node are autorhythmic (can generate own electrical impulses without external simulation). This primarily corresponds to prepotential phase shown in inset (b), because that’s the phase, at the end of which, the threshold for the next action potential is achieved.

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Answer

The threshold potential of the action potential of SA node is achieved due to the slow influx of calcium ions.

Answer

Pacemaker cells in the SA node are autorhythmic (can generate own electrical impulses without external simulation). This primarily corresponds to the rapid depolarization phase shown in inset (b).

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Inset (a) shows the heart’s electrical conduction pathway, starting at the Sinoa...

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