Which hormone among these is not secreted by an endocrine gland

Options

A. ADH
B. PTH
C. `T_(4)`
D. ANF

Answer

To determine which hormone among the given options is not secreted by an endocrine gland, we can analyze each option one by one.

**Step 1: Analyze ADH (Anti-Diuretic Hormone)**
- ADH is secreted by the posterior lobe of the pituitary gland.
- Since the pituitary gland is an endocrine gland, ADH is secreted by an endocrine gland.

**Step 2: Analyze PTH (Parathyroid Hormone)**
- PTH is also known as parathormone and is secreted by the parathyroid glands.
- The parathyroid glands are endocrine glands, so PTH is secreted by an endocrine gland.

**Step 3: Analyze T4 (Thyroxine)**
- T4, or tetraiodothyronine, is a hormone secreted by the thyroid gland.
- The thyroid gland is classified as an endocrine gland, hence T4 is secreted by an endocrine gland.

**Step 4: Analyze ANF (Atrial Natriuretic Factor)**
- ANF is a peptide hormone secreted by the heart.
- The heart is not classified as an endocrine gland, even though it does secrete hormones. Therefore, ANF is not secreted by an endocrine gland.

**Conclusion:**
- Among the options provided, the hormone that is not secreted by an endocrine gland is **ANF (Atrial Natriuretic Factor)**.

**Final Answer: D) ANF**

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