nervous system

Question 1

nervous system stages

Answer 1

sensory input
integration
motor output

Question 2

sensors

Answer 2

detect external stimuli and internal conditions and transmit information along sensory neurons

Question 3

integration

Answer 3

sensory info is sent to the brain or ganglia where internuerons integrate the info

Question 4

motor output

Answer 4

leaves brain or ganglia via motor neurons which trigger activity

Question 5

axon hillock

Answer 5

axon joins the cell body

Question 6

synapse

Answer 6

juction between axon and another cell

Question 7

presynaptic cell

Answer 7

neuron

Question 8

postsynaptic cell

Answer 8

nueron, muscle or gland cell

Question 9

glia

Answer 9

nourish or insulate neurons

Question 10

resting potential

Answer 10

K greater inside

sodium potassium pump use energy of ATP to maintain K and Na gradient

Question 11

depolorization

Answer 11

Na channels open, allowing Na into the cell

Question 12

action potential

Answer 12

resting
threshold
peak 
decline
refactory period

Question 13

electrical synapses

Answer 13

electrical current flows from one neuron to another

Question 14

chemical synapses

Answer 14

chemical neurotransmitter carries info across the gap junction

Question 15

synaptic vesicles

Answer 15

presynaptic nueron synthesizes and packages the nuerotransmitter here

Question 16

synaptic cleft

Answer 16

where it diffuses, received by post synaptic cell

Question 17

system structure

Answer 17

consists of
circuits of neurons and supporting cells
increased cephilization over evolutionary time

Question 18

CNS

Answer 18

brain and spinal cord

responsible for integration or sensory and motor signals

Question 19

PNS

Answer 19

sensory and motor nerves

fight or flight, rest and digest

Question 20

reflex arc

Answer 20

integration of sensory info occurs in the spinal chord without brain involvement

Question 21

gray matter

Answer 21

nueron cell bodies, dendrites unmyelinated axons

Question 22

white matter

Answer 22

bundled axons with myelin sheaths

Question 23

ventricles

Answer 23

shares cerebral spinal fluid with spinal cord