Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?
A.
Urea.
B.
Sebum.
C.
Water.
D.
Lysozymes.
The correct answer is:
A. Urea
Explanation:
Urea is a byproduct of protein metabolism and is formed in the liver from ammonia, which is produced when proteins are broken down. Urea is then transported to the kidneys for excretion, but a small amount is also excreted through sweat glands.
Here’s what the other substances are and their functions:
- B. Sebum: This is an oily substance produced by sebaceous glands to lubricate and protect the skin, not related to the breakdown of proteins.
- C. Water: Sweat is primarily composed of water and helps regulate body temperature, but it does not specifically relate to protein breakdown.
- D. Lysozymes: These are enzymes that break down bacterial cell walls and are present in sweat, but they are not directly related to the breakdown of proteins or formation of ammonia.
Correct answer: A