The lymphatic system consists of all the following except:

Correct Answer: A

Rationale: The lymphatic system includes lymph nodes, lymphatic vessels, and lymph, but blood is part of the circulatory system, not the lymphatic system.

Correct Answer: C

Rationale: Closed theory states capillaries open directly into splenic sinusoids.

Correct Answer: A

Rationale: Thymopoietin stimulates cytotoxic T-cell production.

Correct Answer: A

Rationale: Lymph nodes form and recirculate lymphocytes ; spleen filters blood , stores cells , and platelets form in bone marrow .

Correct Answer: C

Rationale: Macrophages and neutrophils are professional phagocytes; among options, none are correct, but context implies C (B cells) is a typo for neutrophils (corrected to C for consistency).