Read the following statements ( A – E ) and answer the question that follows them:
A. Thyrocalcitonin is a hypocalcaemic hormone .
B. Isthmus in the thyroid is a thin flat of connective tissue .
C. The ovulation from the Graafian follicles is mediated by LH.
D. The source of FSH and TSH is the same.
E. Hormones are non-nutrient chemicals.
How many of the above statement are incorrect ?

Options

A. None
B. One
C. Two
D. Three

Answer

To determine how many of the statements (A - E) are incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A: Thyrocalcitonin is a hypocalcaemic hormone.**
- **Analysis:** This statement is correct. Thyrocalcitonin, also known as calcitonin, is produced by the thyroid gland and helps lower blood calcium levels, making it a hypocalcaemic hormone.

2. **Statement B: Isthmus in the thyroid is a thin flat bone of connective tissue.**
- **Analysis:** This statement is incorrect. The isthmus of the thyroid is not a bone; it is a band of thyroid tissue that connects the two lobes of the thyroid gland. It is made of glandular tissue, not connective tissue.

3. **Statement C: The ovulation from the Graafian follicles is mediated by LH.**
- **Analysis:** This statement is correct. Luteinizing hormone (LH) is responsible for triggering ovulation from the Graafian follicles in females.

4. **Statement D: The source of FSH and TSH is the same.**
- **Analysis:** This statement is correct. Both Follicle Stimulating Hormone (FSH) and Thyroid Stimulating Hormone (TSH) are produced by the anterior pituitary gland.

5. **Statement E: Hormones are non-nutrient chemicals.**
- **Analysis:** This statement is correct. Hormones act as chemical messengers in the body and are indeed classified as non-nutrient chemicals.

### Summary of Findings:
- **Correct Statements:** A, C, D, E (4 statements)
- **Incorrect Statements:** B (1 statement)

### Conclusion:
Only **1 statement (B)** is incorrect.

### Final Answer:
**1 statement is incorrect.**

---