Put the steps of enzyme activity in order from first to last using the drop down menu beside each step. The chemical reaction occurs. A substrate enters the active site of enzyme. New substances called “products” are formed. The enzyme and the substrate bind to form the enzyme-substrate complex.

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.