Pain in an arm and leg on the same side of the body is termed:

Hemiparesis, or unilateral paresis

Explanation:

Hemiparesis, or unilateral paresis is the terminology used when one side of the body is suffering from pain or stillness or weakness.

Hemiparesis  is a problem arising from the neural disturbances. It happens when the spinal cord is not able to send or receive signals or is unable to sense anything. The portion of the body affected by this problem usually suffers from stroke or pain .

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.