flowchart to show transmission of impulse through synapse
Answers
Synapse is a junction between two neurons. signaling transmission from one neuron to another neuron occur through this synapse
Explanation:
- In neuron there are three portion, dendrite, cell body, axon.
- Dendrites act as a receptor for several neurotransmitter released from presynaptic neuron.
- When neurotransmitter binds to the receptor it causes either depolarization by opening Na+ gated ion channel or hyperpolarization by opening Cl- gated ion channel
- If depolarization occur and if it reach threshold value it will generate an action potential by opening voltage gated ion channel in the axon.
- Then nerve impulse passes through the axon and reach axon terminal.
- In response to depolarization Ca2+ gated ion channel open in the axonal terminal region.
- Ca2+ is responsible for the fusion of the neurotransmitter containing synaptic vesicle with presynaptic membrane.
- Neurotransmitter is released at the presynaptic terminal and binds to the receptor present on the post synaptic neuron and generate another action potential.
FLOWCHART
Neurotransmitter binds to the receptor on dendrite
↓
opening of chemical gated Na+ channel
↓
entry of Na+ generate a depolarizing response
↓
if this depolarizing stimulus is sufficient to reach threshold
value it will generate an action potential at axon hillock by
opening of voltage gated Na+ channel.
↓
Transmission of action potential or nerve impulse toward
axon terminal
↓
when depolarizing response reach axon terminal, opening of
Ca2+ channel
↓
Ca2+ causes fusion of neurotransmitter containing synaptic
vesicle with presynaptic membrane
↓
Release of neurotransmitter at synapse and then
neurotransmitter binds to the receptor on dendrites of the post
synaptic neuron