Question

Which of the following is not an endocrine gland?

• A. Pituitary gland
• B. Thyroid gland
• C. Salivary gland
• D. Adrenal gland

Hint:

Remember the key difference: Endocrine glands secrete hormones into the bloodstream (ductless), while Exocrine glands secrete substances through ducts to an exit point (a surface). Saliva exits into the mouth, making the salivary gland exocrine.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Glands in the human body are classified into two main types based on how they release their secretions: - Endocrine glands: These are ductless glands that secrete hormones directly into the bloodstream. These hormones then travel to target organs to regulate various bodily functions.
- Exocrine glands: These glands have ducts through which they release their secretions onto a surface, either exte

Step 2: Detailed Explanation:
- Pituitary gland, Thyroid gland, and Adrenal gland: These are all major glands of the endocrine system. They produce and secrete vital hormones (like growth hormone, thyroid hormone, and adrenaline, respectively) directly into the blood.
- Salivary gland: This gland produces saliva and secretes it into the mouth through ducts. Because it uses ducts to transport its secretion to a specific location (the mouth), it is classified as an exocrine gland.
Therefore, the salivary gland is not an endocrine gland.

Step 3: Final Answer:
The Salivary gland is an exocrine gland, not an endocrine gland.