What is one physiological change that occurs when the sympathetic nervous system is activated?

When the sympathetic nervous system is activated, one prominent physiological change is an increased heart rate. This activation is part of the body's "fight or flight" response, designed to prepare an individual for stressful or potentially dangerous situations. When the sympathetic nervous system is engaged, it releases neurotransmitters such as norepinephrine, which stimulates the heart to beat faster.

Increased heart rate serves to enhance blood flow to vital organs and muscles, providing them with more oxygen and nutrients necessary for quick response and action. This response is crucial in situations requiring heightened awareness and physical readiness. Therefore, it plays a key role in survival by ensuring that the body can function effectively under stress.