**Question:** Anterior pituitary secrets all except

A. Growth hormone (GH)
B. Thyroid-stimulating hormone (TSH)
C. Antidiuretic hormone (ADH)
D. Prolactin (PRL)

**Core Concept:** Anterior pituitary is a part of the endocrine system that produces and secretes several hormones, known as the anterior pituitary hormones or pituitary hormones. These hormones play a crucial role in regulating various physiological processes in the body.

**Why the Correct Answer is Right:** The anterior pituitary secretes four primary hormones:
1. Growth hormone (GH): Promotes growth, cell reproduction, and cell regeneration in humans and animals.
2. Thyroid-stimulating hormone (TSH): Regulates the endocrine system, stimulating the thyroid gland to produce thyroid hormones (T3 and T4).
3. Antidiuretic hormone (ADH): Also known as vasopressin, ADH regulates water reabsorption in the kidneys, helping maintain fluid balance and concentration of urine.
4. Prolactin (PRL): Promotes lactation in females and has other physiological functions such as influencing immune system and bone remodeling.

**Why Each Wrong Option is Incorrect:**
5. Adrenocorticotropic hormone (ACTH): Regulates the adrenal cortex to produce cortisol, aldosterone, and mineralocorticoids. ACTH is secreted by the pituitary gland, not anterior pituitary.
6. Insulin: Promotes glucose uptake in tissues and lowers blood glucose levels. Insulin is produced by the pancreas, not anterior pituitary.
7. Oxytocin: Stimulates uterine contractions during childbirth and milk ejection during breastfeeding. Oxytocin is produced by the hypothalamus, not anterior pituitary.

**Core Concept:** The hypothalamus, located in the brain, releases hormones that stimulate anterior pituitary to secrete its hormones (except for oxytocin and ACTH). These hormones play a crucial role in maintaining homeostasis and regulating various physiological processes in the body.

**Why Each Wrong Option is Incorrect:**
8. Growth hormone (GH): Promotes growth and cell regeneration in humans and animals. It is released by the hypothalamus, not anterior pituitary.
9. Thyrotropin-releasing hormone (TRH): Stimulates the anterior pituitary to release TSH (thyroid-stimulating hormone) which regulates thyroid gland function. TRH is released by the hypothalamus, not anterior pituitary.
10. Follitropin (FSH and LH): Stimulates the ovaries in females and testicles in males to produce sex hormones (estrogen, progesterone, and testosterone). FSH and LH are released by the hypothalamus, not anterior pituitary.

**Core Concept:** The hypothalamus and pituitary gland are interconnected in the hypothalamo-hypothalamic-pituitary-target gland axis, ensuring hormonal