ANATOMY

Detailed explanation-1: -The lymph nodes filter out harmful substances and waste products. They also contain immune cells called lymphocytes that destroy cancer cells and bacteria. The filtered fluid is then returned to the blood circulation.

Detailed explanation-2: -Lymph nodes function to remove debris and pathogens from the lymph, and are thus sometimes referred to as the “filters of the lymph” (see Figure 14.6). Any bacteria that infect the interstitial fluid are taken up by the lymphatic capillaries and transported to a regional lymph node.

Detailed explanation-3: -Bacteria and debris are actively removed from the lymph by macrophages in the sinuses of lymph nodes. Macrophages are phagocytic cells that engulf bacteria and debris.

Detailed explanation-4: -Lymph nodes mainly store immune cells that help the body fight infection but are also places where these cells can be made. They also filter the lymph fluid and remove foreign material such as bacteria and cancer cells.