The nervous system and functions Flashcards
What is the Nervous system
System of nerves and cells that carries messages around body.
The Nervous system is made of two parts
CNS- Central nervous sustem
PNS- Peripheral Nervous sysetm
What is The CNS
What does it do
= composed of the spinal cord and brain
Functions
- Spinal cord allows brain to COMMUNICATE with the rst of body
- Runs from base of ( Brainstem) to lower back
What dos the brain do?
the brain is the control centre of body
what does the spinal chord do?
the spinal chord allows the brain to communicate with the rest of the body.
runs from base of brain to lower back, inside the spinal bones for protectio
What is The PNS
What does it do
= is any nerve outside the brain and spinal cord
Functions
1. Communicate info from organs, glands, muscles ——> Brain
Sends message from brain to muscles and muscles to. brain
PNS has Two subdivisions such as:
Somatic—— Automatic
Somatic
Responsible for carrying messengers from the BRAin —-> SKELETAL muscles
- Voluntary movement
- messengers from senses to brain to be processed
The somatic nervous system uses 2 types of neurons, what are they?
sensory neurons - pick up information from senses and send them to the brain to be processes eg: sight, smell, taste
motor neurons - directly attach to muscles (create voluntary movement)
Somatic
( Motor Nuerons ( nerves) )
- Directly attached to muscles
- Initiates voluntary movement
- Communicates to CNS
Somatic
( Sensory nuerons ( nerves))
- Carry messengers from senses to CNS so the brain can INTERACT with it’s ENVIROMENT.
Automatic nervous system
Controls body’s NON-skeletal muscles ( eg. heart, pupils, internal organs, glands)
( It does everything we DON’T think about)
Automatic
Sympathetic nervous system
- Prepares us for actions
- Fight or flight
- freeze
Automatic
Parasympathetic nervous system
- Calms our body
- returns us to baseline/ normal
( homeostasis)
