Dilation can be triggered by multiple factors. In blood vessels, it is often a response to increased metabolic demands, requiring enhanced blood flow to deliver oxygen and nutrients. Chemical signals such as nitric oxide and prostaglandins play a crucial role in inducing vascular dilation. Hormonal influences, like those from adrenaline during a "fight or flight" response, also contribute to this process. Additionally, mechanical forces such as increased blood pressure can result in the dilation of vessels.
