What is the term for the widening of blood vessels that decreases peripheral vascular resistance?

The term for the widening of blood vessels that decreases peripheral vascular resistance is vasodilation. When blood vessels dilate, or widen, it allows for increased blood flow and reduces the resistance that the blood encounters while moving through the circulatory system. This process can help lower blood pressure and improve circulation, making it particularly important in various physiological responses, such as during physical activity or in response to heat.

Vasodilation is facilitated by various factors, including the release of substances like nitric oxide and the response to certain medications or hormones. Understanding vasodilation is crucial for EMTs, as it plays a significant role in managing conditions like shock and certain cardiovascular emergencies.