PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Which statements is NOT true for melatonin?
|
|
hormone secreted by pineal gland
|
|
|
pigment that gives the colour of the skin
|
|
|
regulates circadian rhythm
|
|
|
stimulated by darkness
|
Explanation:
Detailed explanation-1: -In certain animals, melatonin inhibits melanin dispersion and consequent skin darkening [13]’ apparently by decreasing cyclic adenosine monophosphate (cAMP) production under the influence of melanocyte stimulating hormone (MSH) [14].
Detailed explanation-2: -Answer and Explanation: All of the statements about melanin are true EXCEPT that it (b.) Decreases in concentration within cells during exposure to the sun. Melanin is produced from the amino acid tyrosine through a process known as melanogenesis.
Detailed explanation-3: -The correct option is B (b) only Reason(R): It protects the skin and inner parts from ultraviolet sunrays.
There is 1 question to complete.