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rimrod75 rimrod75
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11 years ago
I'm answering questions on reflex actions so I need to know how the synapse transmits impulses before the relay neuron. If you could put it quite simply that would be even better!
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11 years ago
Synapse is the junction between two neurons. There is a gap between two neurons known as synaptic cleft. Impulse is carried through the synaptic cleft be chemical means i. e. via neurotransmitters. These are cholinergic, dopaminergic and nor adrenergic in nature depending on the neurotransmitter secreted from pre synaptic membrane.
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11 years ago
As the action potential reaches the end of the first neurone, Ca2+ channels are also opened. Ca2+ flows into the cell and this induces several hundred vesicles containing the neurotransmitter to fuse with the presynaptic membrane. The neurotransmitter is released into the synaptic cleft.

The molecules of neurotransmitter bind with complementary receptors (similar to an enzyme and substrate fitting together) in the postsynaptic membrane. This makes the Na+ channels open and depolarisation occurs in the postsynaptic membrane thus starting an action potential.
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o1893220o1893220
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11 years ago
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