Answer to Question 1
Answer: The key to the body's successful immune system is the ability to distinguish self (or proteins that belong to its body) from non-self (proteins that belong to any other living thing).
Answer to Question 2
Answer: Cytotoxic T cells directly kill virus-infected cells and tumor cells. Helper T cells secrete proteins that promote inflammation by calling for the microphages to the site, stimulating B cells, and activating the cytotoxic T cells. Regulatory T cells help lower the immune response once the infection is under control. Memory T cells remember an antigen and therefore can produce new fighting cells rapidly.
The female reproductive system. (a) Sagittal section through the pelvis. (b) Top view of pelvic orga
Summary of Nonspecific Body Defenses
Visceral and Subcutaneous Fat Storage in the Body
Ways to Measure Percentage of Body Fat
Sympathetic Nervous System's Flight or Fight Response
Components of the lymphatic system