When you see an attractive person sit down next to you on the bus, the mad pounding of your heart is under the influence of the nervous system?

The correct answer is - autonomic nervous system.

Explanation:

The autonomous nervous system is a nervous system part that plays a role unconsciously in the body and maintains the functions of the body such as respiratory rate, urination, heart rate, sexual arousal and digestion, and other unconsciously occurring processes.

ANS is of two types sympathetic and parasympathetic both have opposite roles to each other. Sympathetic ANS are responsible for the increase in the heart rate in the influence of epinephrine and other hormones.

Thus, the correct answer is the Autonomic nervous system.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!