Free fatty acids are released by adipose tissue during________________?
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Answer: A. Fasting state
Explanation
Fasting states trigger a decrease in circulating insulin levels combined with an increase in glucagon hormones. This hormonal shift activates hormone-sensitive lipase enzymes within white adipose tissue deposits. Lipolysis hydrolyzes stored triglycerides and releases free fatty acids into the bloodstream for energy. Adipose tissue serves as the primary energy storage depot for excess calories in the human body. Free fatty acids serve as a major metabolic fuel source for skeletal muscle and liver during starvation. Liver beta-oxidation converts these released fatty acids into ketone bodies for extrahepatic tissue usage.
Prolonged fasting or intense endurance exercise heavily relies on adipose tissue lipolysis for survival. Metabolic flexibility allows human bodies to switch from carbohydrate oxidation to fat metabolism smoothly. Impaired regulation of fatty acid release contributes to metabolic disorders like insulin resistance and obesity. Option B represents resting states where energy demands are low and fat storage is generally favored. Option C represents active states where working muscles rely heavily on glycogen alongside fatty acids. Therefore, option A is correct because fasting specifically triggers the hormonal release of free fatty acids.
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