Question

question 8 approximately 10% of energy expenditure goes toward digestion, absorption and metabolism of the food we eat, this is called the thermic effect of food. which of the following things does not fall within the thermic effect of food? a peristalsis. b transfer of amino acids from the intestinal lumen, into intestinal cells, then into the bloodstream. c breathing. d none of the above.

Explanation:

• Peristalsis (Option A): It is the involuntary contraction and relaxation of the muscles in the digestive tract that helps move food along. This is part of the digestive process and thus falls within the Thermic Effect of Food (TEF) as it involves energy expenditure for digestion.
• Transfer of amino acids (Option B): The absorption of amino acids (after protein digestion) from the intestinal lumen into intestinal cells and then into the bloodstream is an energy - requiring process (active transport in many cases) which is part of TEF.
• Breathing (Option C): While breathing is a continuous process, the increased breathing rate (to supply more oxygen for the increased metabolic rate during digestion, absorption, and metabolism of food) is also accounted for in the TEF.

Since all of the given options (A, B, and C) are related to digestion, absorption, or processes that support the metabolism of food (which are components of the Thermic Effect of Food), the answer is that none of the options (as they all are related to TEF).

Answer:

D. None of the above