Question

Which of the following is {not an endocrine gland?}

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

Hint:

Ductless $\rightarrow$ endocrine; ducts to skin (sweat) $\rightarrow$ exocrine.

Answer 1

The Correct Option is D

Step 1: Define endocrine vs exocrine. Endocrine glands are ductless and secrete hormones into the bloodstream; exocrine glands secrete via ducts to surfaces.
Step 2: Classify the options. Pituitary, thyroid, and adrenal are classic endocrine glands. The sweat gland is exocrine (ducts to skin), hence not endocrine.
Step 3: Conclude. \[ \boxed{\text{Sweat gland (Option D).}} \]