The process by which a cell engulfs large particles or other cells by forming vesicles is called:

Correct Answer: A

Rationale: Phagocytosis engulfs large particles or cells.

Correct Answer: B

Rationale: RBCs contain carbonic anhydrase to facilitate CO2 transport; they contribute to viscosity but don't burst in isotonic 0.9% saline.

Correct Answer: A

Rationale: CSF is formed by filtration of plasma in the choroid plexus; glucose is lower (~60 mg/dL) than plasma (~100 mg/dL).

Correct Answer: A

Rationale: HDN affects Rh+ babies of Rh- mothers; anti-D injection post-delivery prevents maternal sensitization.

Correct Answer: D

Rationale: Respiratory alkalosis lowers PCO2 via hyperventilation; metabolic alkalosis raises HCO3-.