biological approach (ass3) Flashcards
(14 cards)
what are dendrites?
branch line structure, carry nerve impulses from neighbouring neurone to cell body
what does the cell body soma include?
nucleus- co raining genetic info
what does the axon do?
carries impulses away from cell body, down the neurone
what is the axon covered in and what does it do?
myelin sheath- speeds us electrical transmission
what are the nodes of ranvier?
gaps between myelin sheath, impulses jump across these speeding up transmission
what are terminal buttons?
end of axon, communicates with next neurone across synapse (hands to feet)
pre-synaptic terminal-> _____-> post-synaptic neurone dendrite
synaptic gap
what travels through synaptic gap?
neurotransmittes
what is the sensory neurone?
long dendrites, found near sensory receptors, short axon
what is a relay neurone?
connects sensory and motor neurone (S_M), short dendrite, found in brain&spinal cord
what is a motor neurone?
connects central nervous system & muscles. short dendrites, long axon
inside neurone the impulses are?
electrical
outside the neurone, impulses are?
chemical
excitatory neurotransmitters increase activity, whereas inhibitory neurotransmitters make us…
decrease in activity
