Which cells in the spleen's red pulp phagocytose old RBCs?

Correct Answer: B

Rationale: Macrophages in red pulp phagocytose RBCs; lymphocytes , T , and B cells are in white pulp.

Correct Answer: B

Rationale: The thymus matures T cells ; B cells mature in bone marrow, macrophages and neutrophils are innate.

Correct Answer: C

Rationale: Neutrophils are rapid innate responders; T and B cells are adaptive, dendritic cells present antigens.

Correct Answer: A

Rationale: Cytotoxic T cells kill infected cells; B cells make antibodies, macrophages and neutrophils phagocytose.

Correct Answer: C

Rationale: IgE is least abundant; IgG is most, IgA is in secretions, IgD is on B cells.