When Mr. T's blood pressure dropped, his heart rate increased. Which part of his autonomic system was responsible for this response? What other signs of autonomic activity did you observe in Mr. T?

Medulla oblongata is responsible for autonomic regulation system.

Explanation:

Autonomic regulation is a controlling system that regulates different function of body such as heart rate, digestion, blood pressure, urination, respiratory rate, papillary response etc.

Hypothalamus is the main center of controlling this functions.

Autonomic dysfunction occur when autonomous nervous system damages, and the effect may be mild to life threatening.

Autonomic activity may leads to certain kind of side effects like-

Dizziness, fainting exercise intolerance. sweating abnormalities. Diarrhea, constipation, difficulty in swallowing. Urinary problems, incomplete emptying of the bladder. Vision problems, blurry vision, vaginal dryness etc.