a lack of potassium intake in your body
Atrophy
the movement of muscles which keeps the surface for gaseous supplied with oxygen causes breathing
Locomotion
Osmosis (whatever) causes cells to go in your fingers. Causing your fingers go wrinlky . I may be wrong (I've copied.)
The movement is caused by the cremasteric muscles. Here is more information: http://en.wikipedia.org/wiki/Testicle
To vibrate your fingers, hold them slightly tense and then quickly relax and tense them in rapid succession. This rapid contracting and relaxing of the muscles causes the fingers to vibrate. Practice and patience can help improve your finger vibrating skills.
Smooth muscles
Your muscles cramp up after exercise if you do not stretch
Strabismus can be caused by a defect in muscles or the part of the brain that controls eye movement.
The bones provide a frame for the body. Muscles are attached to the bones, and when the contract, they pull the bone in one direction. When they relax, the bone is free to return to its previous position, thus causing movement.
Vitamin B12 deficit causing peripheral nerve demyelination.
Joints don't have the ability to move. Joints are where two or more bones meet. One end of muscle attaches to the bone and the other end of the muscle stretches cross the joint and attaches to the bone on the other side of the joint. Muscles work in pairs, so that when one muscle contracts (the only movement that muscle can make), the other of the pair relaxes which causes movement at the joint when the bone is pulled by the muscle.