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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Did you know?
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

