Vasoactive substances

Vasoactive substances are molecules that affect blood vessels by causing them to either widen (dilate) or narrow (constrict). These changes help regulate blood pressure and blood flow to organs. For example, some substances release signals that relax blood vessel muscles, increasing blood flow, while others cause contraction, reducing blood flow. They are essential in maintaining cardiovascular health and responding to various conditions, such as stress or injury. Common examples include hormones like adrenaline, which quickens the heart and increases blood flow during excitement or danger, and nitric oxide, which helps relax blood vessels to lower blood pressure.