Questions: Match the lymphatic organ with its function. 1. Tonsils: Protect against bacteria from entering the pharynx from the nasal or oral cavity 2. Lymph Nodes: Filter lymph; house lymphocytes 3. Spleen: Destroys defective red blood cells, responds to foreign substances in the blood 4. Thymus: Site for the maturation of T cells

The answer is as follows:

1. Tonsils: Protect against bacteria from entering the pharynx from the nasal or oral cavity
2. Lymph: Filter lymph; house lymphocytes
3. Spleen: Destroys defective red blood cells, responds to foreign substances in the blood
4. Thymus: Site for the maturation of T cells

Explanation:

• Tonsils are lymphatic tissues located at the back of the throat and are involved in protecting against pathogens entering through the nasal or oral cavity.
• Lymph is a fluid that circulates through the lymphatic system, filtering out harmful substances and housing lymphocytes (white blood cells).
• The spleen is an organ that filters blood, destroys old or defective red blood cells, and responds to foreign substances in the blood.
• The thymus is a primary lymphoid organ where T cells mature and become capable of mounting an immune response.