When Jana took her first driving lesson, she experienced a number of physiological reactions, such as a racing heart, sweaty palms, and tension in her muscles. These physiological reactions involved the activation of her nervous system.

sympathetic                                                  

Explanation:

The term "sympathetic nervous system" is one of the different parts of an individual's nervous system that generally directs his or her body's rapid "involuntary responses" related to stressful and dangerous situations. Thereafter, a flash flood of his or her body's hormones boosts the body's heart rate and alertness, and hence sending extra blood to his or her body's muscles.

In the question above, the given statement represents the sympathetic nervous system.

answer; the civil right act of 1964;