Question

The chief function of lymph nodes in mammals is to

• A. produce WBCs
• B. produce hormones
• C. destroy old RBCs
• D. destroy pathogen

Answer 1

The correct option is D

destroy pathogen

Explanation of the correct option:

The correct option is D:

1. Pathogens are disease-causing agents.
2. Lymph nodes are small bean-shaped cells that are parts of the body's immune system.
3. The substances that travel through the lymphatic fluid are filtered by the lymph nodes.
4. They contain white blood cells and macrophages which help to fight against pathogens and foreign particles.

Explanation of the incorrect options:

Option A:

1. The White Blood Corpuscles (WBCs) are also known as leukocytes.
2. The WBCs are produced in the bone marrow and are found in the blood and the lymph.

Option B:

1. The chemical messengers that are secreted directly in the blood, then carried to various organs to perform various functions are known as hormones.
2. Hormones are secreted by the endocrine glands.

Option C:

1. The main function of the spleen is to regulate the level of blood cells in the body.
2. Thus, the old and damaged RBCs are destroyed by the spleen.