Create an account
Gland located near the heart; it aids in the body's defence against infection by making antibodies
exaggerated, life-threatening hypersensitivity reaction to a previously encounted antigen
Body's capacity to resist foreign organisms and toxins that can damage tissue and organs; humoral and cell-mediated immunity
Failure of blood cell production due to absence of formation of cells in the bone marrow
excessive bleeding caused by hereditary lack of one of the protein substances necessary for blood clotting
a blood disease characterized by an abnormally small number of platelets in the blood
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together