Question Detail

ZOO 101 ZOO 101 Past Questions Objective Question
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Question

The sinoatrial (SA) node functions as the heart's natural pacemaker by:
Options
A Pumping blood through valves
B Initiating electrical impulses that trigger atrial contraction
Correct Answer
C Distributing oxygenated blood
D Stimulating nerve endings in the myocardium
Correct Answer

Option B is the correct answer.

Detailed Explanation

The SA node, located in the right atrium, spontaneously generates action potentials that spread across the atria, causing them to contract and setting the heart rate.

Hint

This cluster of cells sets the rhythm for the entire heart.

Question Info

Course: ZOO 101
Topic: ZOO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 62 of 2214
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