Asked by Peyton Marion on Jun 19, 2024
Verified
Which part of the heart is known as the pacemaker?
A) AV node
B) SA node
C) Mitral valve
D) Bicuspid valve
SA Node
The sinoatrial node, known as the heart's natural pacemaker, responsible for initiating the electrical impulses that dictate heart rate.
AV Node
A specialized part of the heart's electrical system, acting as a gateway between the atria and ventricles, controlling the heart rate.
Bicuspid Valve
Also known as the mitral valve, it controls blood flow between the left atrium and left ventricle in the heart.
- Identify parts and layers of the heart and their functions
Verified Answer
MY
Millicent Yaa VormaworJun 22, 2024
Final Answer :
B
Explanation :
The SA (sinoatrial) node is known as the pacemaker of the heart as it initiates the electrical impulses that coordinate the contraction of the heart muscle. The AV (atrioventricular) node is a secondary pacemaker, but the SA node is the primary one. Mitral valve and bicuspid valve are both valves in the heart and have no role in the conduction of impulses.
Learning Objectives
- Identify parts and layers of the heart and their functions