Nitric oxide plays a vital role in various biological functions, including vasodilation, neurotransmission, immune response, and apoptosis. For instance, in the cardiovascular system, NO produced by eNOS helps maintain blood pressure and flow by relaxing vascular smooth muscles. In the nervous system, NO acts as a neurotransmitter, while in the immune system, NO generated by iNOS contributes to the body's defense mechanisms against pathogens.
