Explain factors that influence SV changes during exercise including the Frank Starling Mechanism in your answer.
Understand the Problem
The question is asking for an explanation of the factors that affect stroke volume (SV) changes during exercise, and it specifically requests that the Frank-Starling mechanism be included in the response. The Frank-Starling mechanism describes how the heart's stroke volume is influenced by the degree of stretch of cardiac muscle fibers, which can increase with exercise due to increased venous return.
Answer
During exercise, stroke volume increases due to the Frank-Starling mechanism, higher contractility, and changes in preload and afterload.
The Frank-Starling mechanism explains that stroke volume (SV) increases in response to a rise in venous return during exercise due to increased end-diastolic volume. Other factors influencing SV changes during exercise include heart rate, contractility, preload, and afterload.
Answer for screen readers
The Frank-Starling mechanism explains that stroke volume (SV) increases in response to a rise in venous return during exercise due to increased end-diastolic volume. Other factors influencing SV changes during exercise include heart rate, contractility, preload, and afterload.
More Information
The Frank-Starling mechanism allows the heart to adjust its output based on venous return, ensuring that the output matches input, which is crucial during exercise when the need for oxygen and nutrients is higher.
Tips
A common mistake is not considering how contractility and heart rate changes interact with the Frank-Starling mechanism during exercise.
Sources
- Physiology, Frank Starling Law - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Frank-Starling Law - an overview | ScienceDirect Topics - sciencedirect.com
- The Frank-Starling mechanism | Deranged Physiology - derangedphysiology.com
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