Question

question 4
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the linea nigra is caused by increased secretion of which hormone?
thyrotropin
relaxin
melanocyte stimulating hormone
progesterone

Explanation:

Linea nigra is a dark line that appears on the abdomen during pregnancy. Melanocyte - stimulating hormone (MSH) is responsible for skin pigmentation. During pregnancy, hormonal changes lead to an increase in MSH secretion, which causes the darkening of the linea nigra. Thyrotropin is related to thyroid function, relaxin helps in softening ligaments and preparing the body for childbirth, and progesterone is involved in maintaining pregnancy but not directly in skin pigmentation for linea nigra.

Answer:

Melanocyte stimulating hormone