Identify the hormones a, b and c that are labelled in the given flow chart.

a - Gn RH, b - ICSH, c - FSH

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a - GH, b - FSH, c - LH

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a - Gn RH, b - PRL, c- ICSH

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a - Gn RH, b - FSH, c - LH

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Solution

The correct option is D a - Gn RH, b - FSH, c - LH
Hypothalamus secretes GnRH gonadotropin-releasing hormone which stimulates the pituitary gland to synthesise and release the gonadotrophins. The pituitary releases FSH follicle stimulating hormone and LH luteinizing hormone. FSH stimulates growth and development of ovarian follicles and secretion of estrogen hormone. LH stimulates the testes to synthesise and secrete androgens.
So, the correct answer is 'a-GnRH, b-FSH, c-LH'.

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Match the following pituitary hormones with their site of action.

Column I Column II

i) Gn RH a. Thyroid gland

ii) ACTH b. Mammary glands

iii) TSH c. Adrenal gland

iv) Prolactin d. Gonads

If n geometric means between a and b be $G_{1}, G_{2}, . . . . G_{n}$ and a geometric mean of a and b be G, then the true relation is

⎡ ⎢ ⎣ \begin{matrix} b + c & a & a b & c + a & b c & c & a + b \end{matrix} ⎤ ⎥ ⎦ = 4 a b c;

L H S = R H S

G_{1}, G_{2}, . . . . . . . G_{n}

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