What effect does muscle tension have during the fight or flight response?

During the fight or flight response, muscle tension plays a crucial role in preparing the body for immediate physical action. This physiological response, controlled by the sympathetic nervous system, involves the release of adrenaline and other stress hormones that prime the body for quick reactions. Increased muscle tension enhances the ability to respond rapidly to perceived threats, leading to improved speed and reaction time, which are essential for escaping danger or confronting a threat.

Other options do not align with the physiological changes that accompany the fight or flight response. For instance, relaxation (one of the other choices) is the opposite of what happens during this response; instead, the body is geared up for action. Similarly, digestive processes are inhibited during this state as energy is redirected toward muscles and vital organs involved in immediate survival. Lastly, pupil dilation increases to allow more light in, enhancing visual acuity under stress, rather than reducing pupil dilation. This physiological setup underscores the body's preparedness for rapid and effective responses in challenging situations.