Question

MSH is secreted by _________
A) The anterior lobe of the pituitary
B) Middle lobe of the pituitary
C) The posterior lobe of the pituitary
D) Endostyle

Answer 1

Hint:MSH stands for melanocyte-stimulating hormone. These are the group of hormones made up of the pituitary gland, hypothalamus, and skin cells.

Complete answer:
 A pituitary gland is an endocrine gland which is about the size of a pea present in the body. It has an anterior lobe, intermediate lobe, and posterior lobe. The intermediate lobe is responsible for secreting melanocyte-stimulating hormone. Melanocytes help in the production and release of melanin. Melanocytes are present in hair and skin. Deficiency of melanin can lead to various skin diseases and also the production of high melanin can lead to a form of melanoma, a form of skin cancer. High melanin can be a result due to long term sun exposure. MSH receptors present in each individual vary and hence the amount of melanin in each varies. It is for sure that melanin concentration and production is dependent on the exposure to the UV light. Hyperpigmentation can occur in patients who have less cortisol production. But if they do not have an adequate amount of melanin production it may also lead to skin disease and skin cancer.
Endostyle, the anterior lobe of the pituitary and posterior lobe of the pituitary does not produce melanocyte-stimulating hormone hence the correct option is B.

Hence the correct answer is option ‘B’.

Note: Melanocyte is the melanin-producing cell located in the bottom layer of the skin's epidermis, the middle layer of the eye, the inner ear, vaginal epithelium, meninges, bones, and heart. Melanin is a dark pigment primarily responsible for skin color.