What type of response and typical bpm does the SA node generate?

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Multiple Choice

What type of response and typical bpm does the SA node generate?

Explanation:
The SA node is the heart’s natural pacemaker, generating impulses by automaticity. Pacemaker cells in the SA node produce a slow-response type of action potential, meaning the upstroke is Ca2+-mediated rather than Na+-mediated and the membrane voltage rises gradually during phase 4 (the prepotential). This slow, continuous depolarization drives rhythmic firing, and the intrinsic rate of SA nodal tissue is about 60–100 beats per minute. Autonomic input can raise or lower this, but when asked for the baseline behavior, the SA node operates with slow-response activity and a typical rate in the 60–100 bpm range.

The SA node is the heart’s natural pacemaker, generating impulses by automaticity. Pacemaker cells in the SA node produce a slow-response type of action potential, meaning the upstroke is Ca2+-mediated rather than Na+-mediated and the membrane voltage rises gradually during phase 4 (the prepotential). This slow, continuous depolarization drives rhythmic firing, and the intrinsic rate of SA nodal tissue is about 60–100 beats per minute. Autonomic input can raise or lower this, but when asked for the baseline behavior, the SA node operates with slow-response activity and a typical rate in the 60–100 bpm range.

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