Nursing Entrance Exam (NEX) Practice Exam

The correct response is based on the role of the sympathetic nervous system, which is part of the autonomic nervous system. Following strenuous activity, such as playing a tennis match, the body enters a state that requires a heightened level of readiness and energy. This is known as the "fight or flight" response, which is primarily driven by the sympathetic nervous system.

In this scenario, the player's increased heart rate and rapid breathing are crucial physiological changes aiming to deliver more oxygen and nutrients to the muscles. Dilated pupils also occur to enhance vision, allowing the player to better respond to their environment. These adjustments are all designed to improve physical performance and preparedness for rapid action.

While the autonomic nervous system encompasses both the sympathetic and parasympathetic nervous systems, the specific responses described—heightened heart rate, rapid breathing, and pupil dilation—are characteristic of sympathetic activation. The parasympathetic system, on the other hand, promotes relaxation and conservation of energy, countering the effects of the sympathetic nervous system and transitioning the body back to a state of calm after exertion. The central nervous system, which includes the brain and spinal cord, plays a supportive role in processing signals but does not directly govern these autonomic responses during physical activity.