Sebum produced from sebaceous glands in a mammal helps in___________?
Correct answer: A. Protection against micro organisms
- A. Protection against micro organisms
- B. Temperature regulation
- C. Excretion
- D. All of these
Explanation
Sebum forms an oily coating that reduces water loss and contains substances that inhibit the growth of microorganisms on the skin, so its key protective role is antimicrobial protection. The likely mistake is temperature regulation, because skin helps regulate temperature mainly through sweat and changes in blood flow, not sebum.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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