Question

multiple choice question
it is critical that the postabsorptive state maintains blood glucose levels because the ______ cannot use alternative energy substrates except in cases

○ liver
○ skin
○ spleen
○ brain
○ stomach

Explanation:

The brain primarily relies on glucose as its energy source and cannot efficiently use alternative energy substrates (like ketone bodies are used in some cases but not as the main or only option always, and other organs can use fats or proteins). So the brain needs blood glucose maintained in the postabsorptive state. The liver can use other substrates and produce glucose, skin and spleen have other energy - related roles, and the stomach isn't as dependent on glucose as the brain.

Answer:

D. brain