Asked by Dominique Jordan on May 20, 2024
Verified
Which of the following statements regarding intrinsic regulation of the heart is true?
A) Stretching the SA node will decrease generation of action potentials in the node.
B) Decreased venous return increases cardiac output.
C) The heart's pumping effectiveness is greatly influenced by small changes in afterload.
D) If cardiac muscle cells are slightly stretched, they have a stronger contraction force.
E) If cardiac muscle cells are slightly stretched, they have a weaker contraction force.
Intrinsic Regulation
The automatic adjustment mechanisms within organs and systems that maintain a stable internal environment without external intervention.
SA Node
Sinoatrial node, a group of cells located in the right atrium of the heart that generates electrical impulses to start each heartbeat.
Afterload
The pressure the heart must work against to eject blood during systole.
- Understand the influence of autonomic nervous system activity on heart rate and contractility.
Verified Answer
Learning Objectives
- Understand the influence of autonomic nervous system activity on heart rate and contractility.
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