Which of the following is not likely to present in the lymph?

Correct Answer: A

Rationale: Lymph typically contains proteins, microorganisms, and macrophages, but red blood cells are primarily in the blood, not lymph, unless there's injury or pathology.

Correct Answer: C

Rationale: Blood sinusoids collect blood into venous sinuses in red pulp.

Correct Answer: D

Rationale: Macrophages phagocytose debris , destroy erythrocytes , and contribute to iron metabolism (part of B); all apply.

Correct Answer: A

Rationale: Mononuclear phagocytes (macrophages) have irregular surfaces with pseudopodia for phagocytosis ; Golgi and sER are present but not defining , peroxisomes are not notable , nuclei vary .

Correct Answer: C

Rationale: C3 is the most abundant complement protein , central to all activation pathways; C1, C2, C4 are less abundant.