Identifying cell functions from biological labels

Steps:

• Examine the diagram for labelled cells and their associated functions (1: secretion, 2: absorption, 3: protection).
• Match label 1 to absorption in epithelial tissue.
• Match label 2 to protection via mucus production.
• Match label 3 to secretion of enzymes.

Why B is correct:

• Option B (1 3 1) aligns with standard histology: goblet cells (label 1) absorb nutrients, ciliated cells (label 3) protect airways, and parietal cells (label 1) secrete acid per cellular specialization laws.

Why the others are wrong:

• A and C (2 1 3): Incorrectly assign absorption to label 2, which is protective, not absorptive.
• D (3 1 2): Misplaces secretion to label 2, violating glandular cell definitions.

Final answer: B