In the normal conduction sequence, which structure receives impulses directly from the SA node before the AV node?

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Multiple Choice

In the normal conduction sequence, which structure receives impulses directly from the SA node before the AV node?

Explanation:
The impulse from the SA node first excites the atrial muscle. The SA node in the right atrium starts the heartbeat and the electrical signal spreads through the atrial myocardium, causing atrial contraction, before it reaches the AV node. The AV node then delays the signal and passes it on to the bundle of His and Purkinje system to drive ventricular contraction. So, the atria are the structures that receive impulses directly from the SA node before the AV node. The bundle of His, Purkinje fibers, and ventricles all come into play after the signal has traveled through the AV node.

The impulse from the SA node first excites the atrial muscle. The SA node in the right atrium starts the heartbeat and the electrical signal spreads through the atrial myocardium, causing atrial contraction, before it reaches the AV node. The AV node then delays the signal and passes it on to the bundle of His and Purkinje system to drive ventricular contraction. So, the atria are the structures that receive impulses directly from the SA node before the AV node. The bundle of His, Purkinje fibers, and ventricles all come into play after the signal has traveled through the AV node.

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