Final answer:
Vasodilation is the relaxation of the smooth muscle in the wall of a blood vessel, resulting in an increased vascular diameter. It widens the blood vessels and helps regulate blood pressure. During exercise, vasodilation occurs in the blood vessels that supply muscles, allowing more blood to flow to the working muscles.
Step-by-step explanation:
Vasodilation is the relaxation of the smooth muscle in the wall of a blood vessel, resulting in an increased vascular diameter. This allows for the widening of the blood vessels. Vasodilation helps regulate blood pressure and can occur in response to various factors, such as increased demand for oxygen or heat loss.
For example, during exercise, vasodilation occurs in the blood vessels that supply muscles, allowing more blood to flow to the working muscles. This increased blood flow delivers more oxygen and nutrients to the muscles, helping them function efficiently.