Skeletal muscle hyperaemia during exercise is primarily due to:Group of answer choicesactivation of the muscle pumpsympathetic, cholinergic vasodilationmetabolic vasodilators released from contracting skeletal muscle
Question
Skeletal muscle hyperaemia during exercise is primarily due to:Group of answer choicesactivation of the muscle pumpsympathetic, cholinergic vasodilationmetabolic vasodilators released from contracting skeletal muscle
Solution
The primary cause of skeletal muscle hyperaemia during exercise is the release of metabolic vasodilators from contracting skeletal muscle.
Here's a step-by-step explanation:
- When you exercise, your muscles contract and relax repeatedly.
- This muscle activity increases the metabolic rate, meaning your muscles are using more energy.
- As a result, your muscles produce more metabolic byproducts, such as lactic acid and carbon dioxide.
- These byproducts act as vasodilators, substances that widen (dilate) blood vessels.
- The dilation of blood vessels increases blood flow (hyperaemia) to the active muscles.
- This increased blood flow delivers more oxygen and nutrients to the working muscles and helps remove metabolic waste products.
So, while the activation of muscle pumps and sympathetic, cholinergic vasodilation can contribute to hyperaemia, the primary cause is the release of metabolic vasodilators from the contracting skeletal muscle.
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