the sympathetic nervous system is a part of the autonomic nervous system that is operated outside the will. when the brain alarms the body in situations such as stress, excitement, fear, or war, it is the system that prepares the body for this sudden change. when you meet the people you like, he acts. and it leads to events that take place outside of control.
how does it effect?
- the radial muscles contract, the pupil grows.
- saliva production slows down.
- more air is pumped into the lungs.
- the heart rate increases.
- the digestive system slows down and their secretion decreases.
- in the liver, glycogen becomes glucose, is given to the blood, blood sugar increases.
- the bladder relaxes, the sphincter contracts.
- the skeletal muscle vessels expand