i don't no what is the answer?
The organ system composed of tissue that can contract and relax is muscle tissue.
The heart.
relax
cardiac
Achalasia
Such a painful muscle contraction is commonly known as cramp.
Spasm
yes, if anything it will cause a "high" it belongs to the non steroidal drug class NSAIDS and is used to treat back and muscle pain. you do not have to snort it
a cramp
Tetany
relax