Which the following are inhibitory hormones from the hypothalamus?

1. GnRH

2. LH

3. PIH

4. Somatostatin

1 and 2

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2 and 3

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3 and 4

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4 and 1

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Solution

The correct option is D
4 and 1

The hypothalamus contains groups of neurosecretory cells that secrete some stimulating hormones and some inhibiting hormones. Stimulating hormones are Growth hormone-releasing hormone (GH-RH), Gonadotropin-releasing hormone( Gn-RH), Adrenocorticotropin releasing hormone (ACTH-RH), Luteinizing hormone (LH) and Follicle-stimulating hormone (FSH) while inhibitory hormones are Somatostatin, Prolactin-inhibiting hormone (PIH).

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Which the following are inhibitory hormones from hypothalamus?

1. GnRH

2. LH

3. PIH

4. Somatostatin

Column I Column II

(a) T $_{4}$ (i) Hypothalamus

(b) PTH (ii) Thyroid

(d) LH (iv) Parathyroid.

Which of these is true for hypothalamus?

(A) Controls the pituitary gland.

(B) Mainly responsible for calcium regulation.

(D) Controls the entire endocrine system.

Q. Match the column.

Column I	Column II
(a) $T_{4}$	(i) Hypothalamus
(b) PTH	(ii) Thyroid
(c) GnRH	(iii) Pituitary
(d) LH	(iv) Parathyroid

Q. Testosterone is a steroid hormone produced by all vertebrate animals and, in humans and other mammals, it is secreted in large amounts by the testes of males and to a much lesser extent, the ovaries of females. In adult males, testosterone plays a key role in the development of reproductive organs and it promotes the secondary sexual characteristics of body and facial hair, increased muscle and bone mass, and a deep voice. Testosterone, like all hormones, works via long distance signaling and is regulated by other hormones as illustrated below:

Figure 1:

Testosterone regulation by cooperation between the hypothalamus, pituitary, and testicular endocrine glands. The major regulatory hormones involved are luteinizing hormone (LH), follicle-stimulating hormone (FSH) and gonadotropin-releasing hormone (GnRH).

When testosterone levels are low, gonadotropin-releasing hormone (GnRH) is released by the hypothalamus, which in turn stimulates the pituitary gland to release FSH and LH. FSH and LH then stimulate the testis to produce testosterone.
How is homeostasis achieved when testosterone levels begin to rise?

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Which the following are inhibitory hormones from the hypothalamus? 1. GnRH 2. LH 3. PIH 4. Somatostatin

Which the following are inhibitory hormones from the hypothalamus?

1. GnRH

2. LH

3. PIH

4. Somatostatin