Margo was asked to explain a psychological concept in class and experienced a rapid heartbeat, sweaty palms, and noticed that she felt shaky. This division of the autonomic nervous system was most likely activated

Sympathetic nervous system

Explanation:

The sympathetic nervous system is the condition that is also called a condition of fight or flight condition. In this condition, the animal or a human being make a certain prediction about the danger.

This is to deal with stress and a dangerous situation. The response during the danger will response in the manner that whether fight or may flee from the danger. In this process, the response can be triggered through the imaginary or real threat.

Thus Margo explained the psychological concept that was the division of the nervous system is the sympathetic nervous system.