Melanocyte stimulating hormone in frog is released by

Options

A. Hypothalamus
B. Pars nervosa
C. Pars distalis
D. Pars intermedia

Answer

**Step-by-Step Solution:**

1. **Understanding Melanocyte Stimulating Hormone (MSH):**
- MSH, or Melanocyte Stimulating Hormone, is responsible for stimulating melanocytes, which are cells that produce melanin, the pigment responsible for skin color.

2. **Function of MSH:**
- The primary function of MSH is to increase the release of melanin, leading to the pigmentation or darkening of the skin.

3. **Source of MSH in Frogs:**
- In vertebrates, including frogs, MSH is regulated by the hypothalamus, which releases a hormone known as the melanocyte stimulating hormone-releasing hormone (MSH-RH).

4. **Role of the Pituitary Gland:**
- The MSH-RH acts on the pituitary gland, specifically targeting the pars intermedia, which is a part of the pituitary gland.

5. **Release of MSH:**
- The pars intermedia of the pituitary gland is responsible for the actual release of MSH into the bloodstream.

6. **Conclusion:**
- Therefore, the melanocyte stimulating hormone (MSH) in frogs is released by the pars intermedia of the pituitary gland.

**Final Answer:**
- The melanocyte stimulating hormone in frogs is released by the pars intermedia.

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