Synaptic transmission

Question 1

what is synaptic transmission

Answer 1

involves communication between one neuron and another and they are sent electrically with a neuron but there’s a gap between them when an electrical signal cannot be sent so it’s done chemically

Question 2

Steps to synaptic transmission

Answer 2

1. nerve impulse which is the action potential travels down the axon
2. nerve impulse reaches presynaptic terminal
3. triggers the release of neurotransmitters from the vesicles
4. goes into synaptic gap and diffuses across
5. neurotransmitter binds with receptors on the dendrite of postsynaptic neuron
6. neurotransmitters is taken up by the postsynaptic neuron
7. this can be lead to an excitatory or inhibitory response

Question 3

excitatory response meaning

Answer 3

includes acetylcholine and noradrenaline, makes postsynaptic neuron more likely to fire an impulse
-if summed, if the net effect on the post synaptic is excitatory, neuron more likely to fire

Question 4

Inhibitory response meaning

Answer 4

increase serotonin and GADA, makes post synaptic neuron less likely to fire an impulse
-if summed, if the net effect on the post synaptic is inhibitory, neuron less likely to fire

Question 5

summation meaning

Answer 5

axons of presynaptic neurones connect to dendrites of postsynaptic, post synaptic receives info in form of different neurotransmitters, post synaptic decides whether to fire or not through summation

Question 6

how do CNS and PNS come together with sensory relay and motoneurons

Answer 6

stimulus detected by sense organs in PNS which conveys a message along a sensory neuron, message reaches the CNS where it connects with the relay neuron which is transferred to a motor neuron, this carries a message to an effector such as a muscle