MSH of the pars intermedia of the middle pituitary is responsible for
Correct answer: A. The darkening of skin in lower vertebrates
- A. The darkening of skin in lower vertebrates
- B. The light colouration of skin in lower vertebrates
- C. both A and B
- D. The darkening of skin in human beings
Explanation
Pars intermedia is the boundary between the anterior and posterior lobes of the pituitary. It contains three types of cells, i.e. basophils, chromophobes and colloid filled cysts. This area produces melanocyte stimulating hormones or MSH. It stimulates the synthesis of the black pigment melanin in the skin and also causes dispersion of melanin granules in the pigment cells, thereby darkening the colour in certain animals (fishes; amphibians). In man, it has no such role.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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