Question

In an ECG pattern, the P-Q interval indicates how long it takes for the cardiac impulse to travel from

a. S-A node to the atrial muscle fibers
b. S-A node to the ventricular muscular fibers
c. A-V node to the atrial muscle fibers
d. A-V node to the ventricular muscle fibers

Answer 1

The P-Q interval, or PR interval, in an ECG pattern shows the time taken for the cardiac impulse to travel from the SA node to the ventricular muscle fibers, beginning from atrial depolarization to the start of ventricular depolarization.

Step-by-step explanation:

In an ECG pattern, the P-Q interval, or PR interval, indicates the length of time it takes for the cardiac impulse to travel from the Sinoatrial Node (SA node) to the ventricular muscle fibers. Specifically, option (b) S-A node to the ventricular muscle fibers, refers to the atrial depolarization (the P wave) to the initiation of the QRS complex (the depolarization of the ventricles). The PR interval spans from the beginning of the P wave to the beginning of the QRS complex, signifying the time it takes for the impulse to pass from the atria through the Atrioventricular Node (AV node) before reaching the ventricles.