The secretion of endocrine gland's hormones are chemically

Options

A. protein or polypeptides
B. glycoprotenis
C. steroids
D. all of the above

Answer

To solve the question regarding the chemical nature of hormones secreted by endocrine glands, we will analyze each option provided:

### Step-by-Step Solution:

1. **Understanding Hormones**: Hormones are chemical messengers produced by endocrine glands that regulate various physiological processes in the body.

2. **Option 1: Protein or Polypeptide Hormones**:
- These hormones are made up of chains of amino acids.
- Examples include Antidiuretic Hormone (ADH), which helps regulate blood pressure and water balance.

3. **Option 2: Steroid Hormones**:
- Steroid hormones are derived from lipids (fats).
- They include hormones such as testosterone, estrogen, and progesterone, which are primarily involved in reproductive functions.

4. **Option 3: Glycoprotein Hormones**:
- Glycoprotein hormones consist of protein and carbohydrate components, making them more complex.
- Examples include Follicle Stimulating Hormone (FSH), Luteinizing Hormone (LH), and Thyroid Stimulating Hormone (TSH).

5. **Conclusion**: Since hormones can be classified into all the mentioned categories (protein/polypeptide, steroid, and glycoprotein), the correct answer to the question is "all of the above".

### Final Answer:
The secretion of endocrine gland hormones are chemically: **All of the above**.

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