ANSWER:
C) The immune system is closely associated with the lymphatic system.
EXPLANATION:
The immune and lymphatic systems are two closely related organ systems that share several organs and physiological functions.
Lymphoid tissues and organs which are found at various body sites are abundantly populated by lymphocytes (white blood cells which protect against infections and are part of the immune system).
The Lymph Organs are involved in blood filtering and the MATURATION OF LYMPHOCYTES. They include:
Spleen – Functions mainly as a blood filter, removing old red blood cells. It also plays a role in the immune response.
Thymus – Responsible for the development and maturation of T lymphocyte cells.
Red bone marrow – Responsible for maturation of immature lymphocytes, much like the thymus.
In addition, some lymphatic tissue is located in the tonsils, appendix, and in the walls of the gastrointestinal tract.
