Which process causes skeletal muscles in endotherms under prolonged cold exposure to begin shivering?

💡 Explanation

When body temperature drops, the hypothalamus triggers shivering, which involves cycles of muscle contraction and relaxation; increased ATP hydrolysis through futile cycling accelerates metabolic rate, but uncoupled from useful mechanical work, converts energy into heat. Therefore uncoupled contraction causes shivering, and not other options relying on separate biochemical pathways.

• Which outcome occurs to fish embryos when low oxygen?
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• Which consequence results when a hibernating marmot encounters interstitial fluid depletion?
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• Which risk sharply increases when a hibernating groundhog's core body temperature rises above the minimum torpor threshold?