Question

Which of the following examples listed below illustrates homeostasis maintained by a negative feedback? Select one: a. Release of chemical signals by keratinocytes that have been damaged by UV light that will increase the production of melanin. b. The near waterproof secretions of glycolipids that is released by cells in the stratum granulosum. c. The secretion of antibacterial compounds in sebum. d. Removal of nitrogenous compounds like urea within the sweat.

Answer 1

Answer:

Option A, Release of chemical signals by keratinocytes that have been damaged by UV light will increase the production of melanin.

Explanation:

Negtaive feedback mechanism of homeostasis maintains the stability of any internal condition or function through lessening of output of a system or through slow down of a functional system.  

Here in this case the keratinocytes function is reduced by damaging them on exposure to UV light which further triggers the release of chemicals that enhance the production of melanin.

Hence, option A is correct