The major function of Plasma cells is to secrete large amounts of antibody. Which of the following statements regarding plasma cells is correct?

Correct Answer: C

Rationale: Plasma cells, from B cells, have extensive rough ER for antibody synthesis, not thin cytoplasm.

Correct Answer: B

Rationale: Echinoderms lack adaptive immunity (T/B cells); bony fish have it.

Correct Answer: C

Rationale: Protein C inhibits inflammation; TNF-α promotes it.

Correct Answer: C

Rationale: The lymphatic system returns fluid and proteins and transports lipids, but not hormones to intestinal muscle.

Correct Answer: A

Rationale: CD4 (helper T) and CD8 (cytotoxic T) are surface proteins aiding antigen recognition.