Which organ system is primarily associated with blood and blood-forming tissues?

• A. Integumentary
• B. Hematologic
• C. Endocrine
• D. Lymphatic

Answer: (B)

Blood and the tissues that form it are managed by the hematologic system. This system includes the components of blood—red cells, white cells, and platelets—and the tissues that generate and recycle them, with bone marrow as the primary site of hematopoiesis and organs like the spleen contributing to blood filtration and immune cell turnover. The other options correspond to skin protection and temperature regulation (integumentary), hormone production (endocrine), or immune drainage (lymphatic), rather than the direct production and maintenance of blood. So the hematologic system is the best fit for blood and blood-forming tissues.