Flexeril is a muscle relaxant. It is used mostly for tight or painful back muscles.
The drug Proventil is used to treat asthma, bronchitis, and similar breathing problems. Proventil is a bronchodilator that relaxes muscles in the airways and increases air flow to the lungs.
It relaxes your muscles to decrease pain and inflammation in your muscles.
muscles
I think what your after is called an antagonistic pair of muscles, for example the bicep and the tricep. When the bicep is contracting the tricep relaxes and when the tricep is contracting the bicep relaxes.
Smooth muscles
Rigormortis which is stiffening of the muscles after death. After awhile though the body relaxes.
Nicotine is non-addictive
muscles relaxes
When the bicep contracts, the tricep relaxes. These pair of muscles are known as antagonists which means as one contracts, the other relaxes and vice versa.
The ciliary muscles
because it depresses the muscles in your body and relaxes them
it relaxes the pain in your muscles.