Question

Which of the following becomes a major fuel for the body only when the other fuels are unavailable?

1) protein
2) fat
3) carbohydrate
4) water

Answer 1

Answer: Protein is use as major fuel for the body when other fuel are unavailable.

Step-by-step explanation:

Fuel for body are the energy needed to perform daily activities by the body. The main fuel for the body is carbohydrates such as starches which is the broken down to glucose which is the main energy source. Protein is use as body fuel when other sources of body fuel are not available because protein is an essential part of the tissues that perform both structural and functional role and its synthesize important enzymes and hormones, it is use as body fuel when there is energy starvation and it only contribute 5 percent of energy source.

Answer 2

1 protein

Step-by-step explanation:

Protein becomes source of energy in absence of fats and Carbohydrate. This is what takes place in extreme starvation; For example in fasting, when supplies of Carbohydrate and Fats are depleted, cellular protein in the body especially muscles cells begin to breakdown, to amino acids. The Amino acids are converted in the liver to GLUCOSE.This is GLUCONEOGENESIS.

The breakdown of muscle protein causes loss of muscle mass and drop of weight during starvation.