Which of the following hormones of the human body are not secreted by an endocrine gland?

Options

A. Parathyroid hormone
B. Growth hormone
C. ANF
D. Thyroxine

Answer

To solve the question "Which of the following hormones of the human body are not secreted by an endocrine gland?", we will analyze each option provided in the question.

### Step 1: Analyze the options

1. **Parathyroid hormone (PTH)**:
- PTH is secreted by the parathyroid glands.
- Since parathyroid glands are endocrine glands, this option is incorrect.

2. **Growth hormone (GH)**:
- GH is secreted by the anterior pituitary gland.
- The pituitary gland is also an endocrine gland, making this option incorrect as well.

3. **Arterial Natriuretic Factor (ANF)**:
- ANF is a peptide hormone secreted by the heart.
- The heart is not classified as an endocrine gland, which makes this option correct.

4. **Thyroxin**:
- Thyroxin is secreted by the thyroid gland.
- The thyroid gland is an endocrine gland, so this option is incorrect.

### Step 2: Conclusion
After analyzing all the options, we find that the only hormone that is not secreted by an endocrine gland is **Arterial Natriuretic Factor (ANF)**. Therefore, the correct answer to the question is ANF.