Question
Biology Question on excretory products and their elimination
A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of:
A
fats
B
ketones
C
amino acids
D
glucose
Answer
ketones
Explanation
Solution
During prolonged fasting, when the body's glycogen stores are depleted, it starts breaking down fat for energy. The breakdown of fats produces ketone bodies, such as acetoacetate and beta-hydroxybutyrate, which can be detected in the urine. This condition is known as ketonuria and is a common physiological response to fasting or low-carbohydrate diets. The presence of ketones in urine is an indication that the body is using fat as an energy source.
So, the correct option is (B): ketones