Question

[BLANK]: The first wave on an ECG that follows the firing of the SA node. This wave is small and signals the depolarization of the atria immediately before they contract.

Answer 1

The P wave on an ECG represents the depolarization of the atria and signals the immediate contraction of the atria.

Step-by-step explanation:

The first wave on an ECG that follows the firing of the SA node is called the P wave. The P wave represents the depolarization of the atria, which is the electrical activation that occurs before the atria contract. It is a small wave on the ECG and is immediately followed by the contraction of the atria.