Question

question 35
mark this question
during prolonged starvation, which is the primary source of energy directly used by glucose - dependent tissues and organs?
amino acids
ketones
glycogen
fatty acids

Explanation:

During prolonged starvation, glycogen stores are depleted. Fatty acids cannot cross the blood - brain barrier (a key glucose - dependent organ). Amino acids are used for gluconeogenesis but are not the direct energy source. Ketones (ketone bodies) can be produced from fatty acid breakdown in the liver and can cross the blood - brain barrier and be used as an energy source by glucose - dependent tissues and organs.

Answer:

Ketones