Muscle injuries and dehydration can also trigger cramps. Dehydration is the excessive loss of fluids in the body. Low levels of any of the following minerals that contribute to healthy muscle function may also cause muscle cramps: calcium.
The heart is a part of the cardiovascular system in fact its the main part so if you have heart disease another way of saying this is you have cardiovascular disease.
SUBSTANTIA NIGRA - smooth initiation of movement (Parkinson's disease) RETICULAR ACTIVATING SYSTEM (RAS) in both the brainstem and the midbrain. Functions in arousal, alertness,sleep. A diffuse relay system to the upper parts of the brain.