neuromuscular junction

Question 1

what happens to stimulate the neuro musclar junction

Answer 1

impulse arrives at presynaptic neuron

Question 2

when the impulse arrives at pre-synapticneurons what does it stimulate

Answer 2

ca+ channels open

Question 3

what does opening of the ca+ channels cuase

Answer 3

ca+ diffuse into presynaptic knob

Question 4

what does the ca+ fuse with

Answer 4

synaptic vesicles

Question 5

what happens to these vesicles

Answer 5

fuse with pre-synaptic membrane

Question 6

what does the fusing to the membrane allow

Answer 6

vesicles release acctylecholine into synaptic cleft

Question 7

what happens to the acteylcholine

Answer 7

diffuses across cleft binds to receptors om na+ channels on post-synaptic membrane

Question 8

what are the receptors on the post synaptic membrane

Answer 8

na+channels

Question 9

what does the acetylbinding to the receptors stimulate

Answer 9

na+ channels open

Question 10

once the na+ channels are open what happens

Answer 10

na+ enters

Question 11

what happens wen na+ enters the membrane

Answer 11

membrane depolerises

Question 12

what does the na+ diffusion cause

Answer 12

an action potential generated and passed through muscle fibres

Question 13

what is the differance betwee a neuromuscular junction and a cholegernic synapse

Answer 13

neuromuscular links motor neuron to muscle

Question 14

what is the main mechanism to muscle contraction

Answer 14

sliding filiment mechanism

Question 15

what happens to the i-band during contraction

Answer 15

i-band becomes narrower

Question 16

what happens to the A-band during contraction

Answer 16

a-stays stays the same

Question 17

what happens to the Z-band during contraction

Answer 17

z-lines become closer together

Question 18

what happens to the h-zone during contraction

Answer 18

h-zone stays the same