Such a painful muscle contraction is commonly known as cramp.
When the bicep contracts the triceps relax
relax
When one muscle in a pair contracts the other expands.
relax
Relax
Spasm
relax
Muscles cramps occur when a muscle contracts and does not relax. This causes pain in one or sometimes multiple muscles.
Yes. If not, the action at the joint will be incomplete and dysfunctional. As a whole, a muscle fiber is either contracted or relaxed (the all-or-none principal).
Definitely. Your heart is a muscle, and muscle relaxers do exactly what they sound like: relax your muscles.An overdose of muscle relaxers can also relax your diaphragm (the muscle beneath you lungs that contracts and expands, allowing you to breathe). Relaxation of the diaphragm would inhibit contraction and, therefore, breathing.
When a muscle contracts it causes flexion and when muscles relax they cause extension
When a muscle cramp occurs, the muscle contracts forcibly and involuntarily and doesn't relax for the time the cramp lasts. The cramp can last from few seconds up to few minutes.