What are three things that can effect the breathing system?

Changes in Respiratory System. The short-term effect of exercise on respiratory system is usually quite extensive and that is mainly due to the changes in the concentration of oxygen and carbon dioxide in the blood. It is due to these changes that you will notice your breathing rate go up quickly

Explanation:

a, i am pretty sure.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.