Asked by Michael Stacy on Jul 18, 2024
Verified
Which structure is responsible for setting the heart rate?
A) atrioventricular node
B) intercalated disk
C) sinoatrial node
D) pericardium
E) septum
Heart Rate
The number of heartbeats per unit of time, typically expressed as beats per minute (BPM).
Sinoatrial Node
A group of cells in the heart that generates electrical impulses, acting as the heart's natural pacemaker.
Atrioventricular Node
A part of the heart's electrical system that delays the signal before passing it from the atria to the ventricles, allowing the heart’s chambers time to fill with blood.
- Explain the anatomy and role of the heart.
- Identify physiological responses and adaptations in the cardiovascular system.
Verified Answer
MN
Melanie NowellJul 24, 2024
Final Answer :
C
Explanation :
The sinoatrial node (SA node) is responsible for setting the heart rate by initiating each heartbeat. It is located in the upper part of the right atrium and is the natural pacemaker of the heart. The atrioventricular node (AV node) is responsible for conducting the electrical impulses from the SA node to the ventricles, but it does not set the heart rate. The intercalated disk, pericardium, and septum are all important structures in the heart but they do not play a direct role in setting the heart rate.
Learning Objectives
- Explain the anatomy and role of the heart.
- Identify physiological responses and adaptations in the cardiovascular system.