Synapse

Question 1

method by which two neurons communicate with each other. Involves chemical transmission (occurs less quickly)

Answer 1

Synaptic transmission

Question 2

regions between neurons or between neurons & effectors

Answer 2

Synapse/synaptic cleft

Question 3

Synapse between the axon terminal of the motor neuron & muscle/gland.

Answer 3

Neuromuscular junction

Question 4

carries impulse to the synapse

Answer 4

presynaptic neuron

Question 5

carries impulse away from the synapse

Answer 5

postsynaptic neuron

Question 6

effect produced by the accumulation of transmitter chemicals from 2 or more neurons

Answer 6

Summation

Question 7

common neurotransmitter that is released by endplates of presynaptic neurons & diffuses across the synapse to receptors on postsynaptic neuron

Answer 7

Acetylcholine

Question 8

An enzyme released shortly after acetylcholine to limit its action by breaking it down

Answer 8

Cholinesterase

Question 9

incoming action potential in the pre-synaptic neuron causes Ca2+ channels to open which…

Answer 9

Step 1 in events at the synapse

Question 10

…causes the vesticles containing neurotrasmitter molecules to fuse with membrane

Answer 10

Step 2 in events at the synapse

Question 11

Vesticles then release neurotransmitters(by exocytosis) into synaptic cleft where they diffuse across to postsynaptic neuron

Answer 11

Step 3 in events at the synapse

Question 12

Neurotransmitter binds to a receptor & opens a chemically-gated ion channel

Answer 12

Step 4-5 in events at the synapse

Question 13

With the channel open, ions (Na+) diffuse into the post-synaptic neuron and initiates action potentail & signal is successfully passed on

Answer 13

Step 6 in events at the synapse

Question 14

Neurotransmitter is broken down.This ensures tha tthe neurotransmitter’s effects is brief & precise. Neurotransmitter molecules can be recycled or diffuse away(Reuptake)

Answer 14

Step 7 in events at the synapse

Question 15

Increases the permeability of post-synaptic neuron to Na+, moving it closer to threshold and making it more likely to fire.

Answer 15

Excitatory

Question 16

decreases the permeability of post-synaptic neuron to Na+, moving it farther from threshold and making it less likely to fire.

Answer 16

Inhibitory