PATHOLOGY MCQ
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which statements is NOT true for melatonin?
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hormone secreted by pineal gland
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pigment that gives the colour of the skin
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regulates circadian rhythm
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stimulated by darkness
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Explanation:
Detailed explanation-1: -Melatonin drives the aggregation of pigment granules, and thus the lightening of the skin, through its binding with specific receptors located on skin melanophores [3, 4].
Detailed explanation-2: -Skin color varies considerably from individual to individual and is generally determined by the presence of melanocytes, carotene, oxygenated hemoglobin, and local blood flow. Melanocytes, found in the deep basal layer of the epidermis, contain brown granules called melanin.
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