All of the following tissues are dependent on insulin for its glucose entry EXCEPT:

Correct Answer: D

Rationale: β cells of the pancreas do not require insulin for glucose entry; they use GLUT2 transporters independently. Other tissues listed rely on insulin via GLUT4.

Correct Answer: C

Rationale: The anterior pituitary produces 5 trophic hormones: TSH, ACTH, FSH, LH, and GH (PRL is sometimes included but not always trophic).

Correct Answer: B

Rationale: Vitamin C is water-soluble, unlike the fat-soluble vitamins A, D, E, and K.

Correct Answer: D

Rationale: The submandibular gland produces ~70% of saliva; parotid is serous, not mucous, and sublingual is mixed.

Correct Answer: B

Rationale: Secretin inhibits gastrin secretion to reduce acid production; atropine doesn't affect it, adrenaline may increase it.