Which factor does NOT primarily affect preload? A) Compliance of the ventricle B) Amount of blood in the ventricle C) Blood viscosity D) Venous return
Understand the Problem
The question is asking about the factors that affect preload in the cardiovascular system. Specifically, it is asking which of the given options does not have a primary impact on preload. Preload is influenced by the volume of blood in the ventricle and the compliance of the ventricle, while blood viscosity is typically not a primary determinant.
Answer
Blood viscosity.
The factor that does NOT primarily affect preload is blood viscosity.
Answer for screen readers
The factor that does NOT primarily affect preload is blood viscosity.
More Information
Preload is primarily influenced by the volume of blood entering the ventricles and venous return, while blood viscosity primarily affects systemic vascular resistance, not preload.
Tips
A common mistake is assuming all factors related to blood have an equal impact on preload. Understanding the distinction between how viscosity and volume affect blood dynamics is crucial.
Sources
- Physiology, Mean Arterial Pressure - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Heart Preload - an overview | ScienceDirect Topics - sciencedirect.com
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