Question

Which of the following is not a hormone?

• A. Progesterone
• B. Thyroxine
• C. Haemoglobin
• D. Oestrogen

Hint:

Remember the key difference: Hormones are chemical messengers for regulation. Proteins like haemoglobin are functional molecules that perform specific tasks like transport.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
A hormone is a chemical messenger produced by endocrine glands and released into the bloodstream to regulate the activity of cells or organs. The question asks to identify the substance that is not a hormone from the given options.

Step 2: Detailed Explanation:
- Progesterone and Oestrogen are steroid hormones, primarily involved in the female menstrual cycle and pregnancy.
- Thyroxine is a hormone produced by the thyroid gland that regulates metabolism.
- Haemoglobin is a protein found in red blood cells. Its primary function is to transport oxygen from the lungs to the body's tissues. It is a protein, not a chemical messenger hormone.

Step 3: Final Answer:
Progesterone, Thyroxine, and Oestrogen are hormones, while Haemoglobin is an oxygen-carrying protein. Therefore, Haemoglobin is not a hormone.