Nervous Systen CNS/PNS
what makes up the cns
brain & spine
what makes up the pns
arms, legs, extention away from your spine
what do dendrites do
take in neurotransmitters and bring them to cell body for analasis
what does the cell body do
analyzes and converts the messages and relays message through axon
what does the axon terminal do
it releases neurotransmitters that will relay the message to the next neuron
what is the synapse
the space between neurons, where neurotransmitters are released by the axon terminals and picked up by dendrites
what is the pathway after you come in contact with a stimulus
1. stimulus activates a sensory neuron (receptor)
sensory neurons bring message to the brain
2. brain analyzes the message
3. brain sends message through motor nerves to eventually creates a motor response
what are the 5 parts of the brain
1. cerebrum
2. cerebellum
3. brain stem
4. cranium (skull)
5. meninges
what is the cerebrum in charge of (6)
emotions, intelligence, senses, thoughts, voluntary motion, dreams
what is the cerebellum in charge of
coordination, balance, fine tune motion
what is the brain stem in charge of
involuntary actions and motion (breathing, body temp.)
what is the difference between sensory and motor neurons
sensory neurons sense
motor neurons react
what do sensory receptors do
they sense and convert stimuli into nervous signal that goes to sensory neurons
what connects the pns to the brain
the spinal cord
what is responsible for the reflex arc
the spinal cord
what protects the spine
meninges
name the 4 steps in the reflex arc
1. sensory receptor feels the hit
2. sensory neurons relay message to cns (spine)
3. reflex arc from the spine sends a message back to the toe using motor neurons, and you move your foot away from the hammer
4. spine sends signal to the brain to analyze the situation
then you feel pain
which type of matter is on the outside and inside in the brain (cerebrum)
white matter inside
grey matter outside
which type of matter in on the outside and inside in the spine
grey matter inside
white matter outside
why is white matter on the outside of the spinal cord
so reflexes can be processed faster because signal won't have to go through grey matter
what is white matter made up mostly of, and why does it get its color
made mostly of axons, white because of myelin sheath made out of fat
give the 6 simple steps from a stimuli to a muscular response
stimulus --> sensory receptor --> sensory neurons (pns->cns) --> brain (for analysis) --> motor neurons (cns->pns) --> muscular response