Explain factors that influence SV changes during exercise including the Frank Starling Mechanism in your answer.
Understand the Problem
The question is asking to explain the various factors that affect stroke volume (SV) changes during exercise, specifically highlighting the Frank-Starling mechanism as part of the explanation. This involves discussing physiological responses and mechanisms of the cardiovascular system during physical activity.
Answer
Increased venous return, myocardial contractility, and afterload impact stroke volume via the Frank-Starling mechanism during exercise.
Factors that influence stroke volume (SV) changes during exercise include increased preload due to increased venous return, which activates the Frank-Starling mechanism. This mechanism allows the heart to increase SV by matching ventricular output with increased end-diastolic volume. Other factors are myocardial contractility and afterload.
Answer for screen readers
Factors that influence stroke volume (SV) changes during exercise include increased preload due to increased venous return, which activates the Frank-Starling mechanism. This mechanism allows the heart to increase SV by matching ventricular output with increased end-diastolic volume. Other factors are myocardial contractility and afterload.
More Information
The Frank-Starling mechanism ensures that the heart efficiently meets the body's demands during exercise by regulating stroke volume in response to the amount of blood returning to the heart.
Tips
A common mistake is not considering the balance between preload, afterload, and contractility in determining stroke volume changes.
Sources
- Physiology, Frank Starling Law - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Frank-Starling Law - ScienceDirect Topics - sciencedirect.com
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