inert	not moving
intestine	a long tube through which food trravels from the stomach
moist	wet
to retain	to keep sth
proliferation	a very quick increase in the number
graft	a piece of skin/bone etc. cut from one part of a body and joined to another part
malfunction	failure
donor	a person who gives a part of his body to a graft
recipient	a person who receives a graft
to tailor	to fit
viral	caused by a virus
diffusion	the process of spreading into a surrounding substance