After the SA node, impulses spread through which pathways to cause contraction of the atria?

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Multiple Choice

After the SA node, impulses spread through which pathways to cause contraction of the atria?

Explanation:
The main idea here is how the atria are electrically activated after the SA node. Impulses spread through specialized atrial conduction pathways, including the internodal tracts and Bachmann's bundle, which rapidly depolarize the atrial myocardium. This coordinated spread causes the atria to contract in unison and sets the stage for the impulse to reach the AV node, guiding ventricular activation. The other structures—ventricular conduction system, coronary arteries, and myocardial veins—are not involved in transmitting the impulse across the atria.

The main idea here is how the atria are electrically activated after the SA node. Impulses spread through specialized atrial conduction pathways, including the internodal tracts and Bachmann's bundle, which rapidly depolarize the atrial myocardium. This coordinated spread causes the atria to contract in unison and sets the stage for the impulse to reach the AV node, guiding ventricular activation. The other structures—ventricular conduction system, coronary arteries, and myocardial veins—are not involved in transmitting the impulse across the atria.

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