The major energy sources for non-nervous tissue during the postabsorptive period are fatty acids and ketones.

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Quizplus · Accepted Answer

During the postabsorptive period, when there is no food in the digestive system, non-nervous tissues primarily rely on fatty acids and ketones for energy. This is because glycogen stores in the liver and muscles are depleted, and glucose is not available from the diet or from glycogen breakdown. While glucose can be synthesized from amino acids through gluconeogenesis, this process is mostly used to maintain blood glucose levels for the brain and red blood cells, as these tissues cannot use fatty acids or ketones for energy.

The Major Energy Sources for Non-Nervous Tissue During the Postabsorptive