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.
-either centrally or locally controlled-during exercise, sympathetic system reduces blood flow to kidneys and digestive tract and increases blood flow to skeletal muscles-metabolite accumulation in a tissue affects local circulation without affecting circulation elsewhere in the body.