CSCS Scientific Foundations Complete Practice Exam 2026

During exercise, the sympathetic nervous system activates the "fight or flight" response, which leads to several physiological changes that prepare the body for physical activity. Among these changes are an increased heart rate, increased blood pressure, and enhanced airway dilation to improve oxygen delivery.

The correct answer is that decreased blood flow to muscles is not a physiological response associated with sympathetic activation during exercise. In fact, one of the primary roles of the sympathetic nervous system during exercise is to redirect blood flow to the muscles that are working hard. This is achieved through vasodilation of blood vessels supplying the skeletal muscles and vasoconstriction of vessels supplying non-essential areas. As a result, blood flow to the active muscles actually increases, facilitating better oxygen and nutrient delivery while also helping to remove metabolic waste products.

Thus, the choice indicating decreased blood flow to muscles is incorrect, as the sympathetic nervous system's role during exercise ensures that blood flow is maximized to support muscular activity.