Question

Which one of the following endocrine glands stores its secretion in the extracellular space before discharging it into the blood?

• A. Thyroid
• B. Testis
• C. Adrenal
• D. Pancreas

Answer 1

The correct option is A

Thyroid

The correct option is A.

The explanation for the correct option :

1. Glands that secrets their products such as hormones directly into the blood without ducts are called endocrine glands.
2. Hormones help the body maintain and regulate various functions.
3. The hormones released by the thyroid are bound to a protein called thyroglobulin which is stored in the follicular lumen.
4. Thus, the thyroid stores its secretions in extracellular spaces before discharging them into the bloodstream.

The explanation for the incorrect option :

Option B:
The hormone secreted by testis is testosterone is stored and secreted by Leydig cells present between seminiferous tubules. Hence it secrets its secretions from these cells to the bloodstream.

Option C:
Adrenal glands are situated at top of both kidneys and secrets their hormones through suprarenal veins.

Option D:

1. The pancreas acts as a heterochrony gland which means it acts as an exocrine and endocrine as well.
2. Pancreatic hormones produce endocrine cells present in clusters called islets of Langerhans from where hormones are released into the blood.

Final answer: The Endocrine Gland Thyroid stores its secretion in the extracellular space before discharging it into the blood.