AP BIOLOGY

Detailed explanation-1: -Some cells of the immune system can recognise cancer cells as abnormal and kill them. But this may not be enough to get rid of a cancer altogether. Some treatments aim to use the immune system to fight cancer.

Detailed explanation-2: -Cytotoxic T lymphocytes (CTL) are the cells that recognize and destroy cancer cells, and they’re first activated in tumor-draining lymph nodes. From there, they enter the bloodstream to reach tumors and battle malignant cells.

Detailed explanation-3: -Different cells fight different types of cancer. For example, one way the immune system fights cancer is by sending out a special form of white blood cells called T cells: The T cells see cancer as “foreign” cells that don’t belong in the body. The T cells attack and try to destroy the cancerous cells.

Detailed explanation-4: -The main reason the human body is unable to fight cancer is because it cannot recognize it. This is because cancer cells consist of the patient’s own DNA, which the body’s immune system recognizes as natural.