Which of the following is the primary fuel source for resting skeletal muscle during fasting?
Understand the Problem
The question is asking to identify the main fuel source that powers skeletal muscles when the body is at rest and in a fasting state. This requires knowledge of human physiology and how the body utilizes different energy sources under specific conditions.
Answer
Fatty acids.
During fasting, the primary fuel source for resting skeletal muscle is fatty acids.
Answer for screen readers
During fasting, the primary fuel source for resting skeletal muscle is fatty acids.
More Information
During fasting, the body shifts to using stored fats for energy to conserve glucose for the brain and other essential functions. Skeletal muscles readily use these fatty acids when at rest.
Tips
A common mistake is to assume glucose is always the primary fuel source, but the body adapts its fuel usage based on availability and the body's needs.
Sources
- Dynamic Adaptation of Nutrient Utilization in Humans - Nature - nature.com
- Metabolic aspects of low carbohydrate diets and exercise - nutritionandmetabolism.biomedcentral.com
- Use of endogenous carbohydrate and fat as fuels during exercise - cambridge.org
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