CNS consists of your brain and spinal cored and there are bones that protect the CNS when you get into accidents.
Peripheral Nervous System
PNS consists of the nerves that go to and from the CNS. There is no bony protection for the PNS which makes it vulnerable and easy to hit.
Sympathetic nervous system
emergency situations: dilates pupils, heart beats faster and stronger, relaxes airways for deeper breathing, inhibits digestion, increases blood flow to skeletal muscles.
Parasympathetic nervous system
body at rest: constricts pupils, heat beats slower, constricts airways, stimulates digestion, reduces blood flow to skeletal muscles.
How do the sympathetic and parasympathetic systems work together?
Both systems make up the autonomic system of the PNS. They ensure that the body responds appropriately to different situations.
Neurotransmitters
nerve cells that communicate with each other using chemicals called neurotransmitters. A correct combo of these sends an electrical current to sweet down the nerve cell.
How do neurotransmitters work?
The electrical signal travels along an axon. Ions move in and out the membrane and once the electrical current reaches the end of the cell, other chemicals are released, helping the nerve cells communicate.
