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.
Human Body Muscle Diagram
The planes of the body. The sagittal plane is vertical from front to back, the frontal plane is vert
The major muscles of the human body, anterior side.
Digestive System
Social scientists have not done well at devising theories to explain lovely romantic moments
The pH scale and relationship between bicarbonate and carbonic acid