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synapse (the “gap”)

PRE-synaptic neuron. synapse (the “gap”). POST-synaptic neuron. pre-synaptic neuron. vesicle (bubble). neurotransmitter. axon terminal. synapse. receptor. post-synaptic neuron. 1. electrical signal moves down axon to axon terminal 2. vesicles move toward pre-synaptic membrane.

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synapse (the “gap”)

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  1. PRE-synaptic neuron synapse (the “gap”) POST-synaptic neuron

  2. pre-synaptic neuron vesicle (bubble) neurotransmitter axon terminal synapse receptor post-synaptic neuron

  3. 1. electrical signal moves down axon to axon terminal 2. vesicles move toward pre-synaptic membrane

  4. 3. vesicle fuses with presynaptic membrane

  5. this releases neurotransmitter molecules (purple balls) into the synapse

  6. neurotransmitters cross the synapse if they fall into a matching receptor, the postsynaptic neuron may fire

  7. there can be different KINDS of neurotransmitters acetylcholine (uh-SEE-tul-KOL-een) dopamine (DOPE-uh-meen) and different kinds of RECEPTORS

  8. note there are receptors for both purple and orange neurotransmitters on the postsynaptic neuron • in reality there are about 60 different neurotransmitters and receptors • a neurotransmitter must fall into the proper receptor or else no signal will be sent • different parts of the brain have different concentrations of receptors and neurotransmitters

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