Neurological Disorders Lesson 3.2 How do our neurons communicate with each other? Chemical Signal Electrical Signal.

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Neurological Disorders Lesson 3.2 How do our neurons communicate with each other? Chemical Signal Electrical Signal

Do Now: Sleeping Beauty just pricked her finger and is feeling a lot of pain. Model the neurons involved in Sleeping Beauty sensing this pain. In order for one neuron in this pathway to send information to the next, how would you change the electrical signal of the axon into a chemical signal at the synapse ?

Pain Pathway Projection neuron Interneuron Motor neuron Sensory neuron

Converting an Electrical Signal to Chemical Signal Chemical Signal Electrical Signal

Synaptic Transmission Electrical Signal Neurotransmitter

Electrical Signal Synaptic Transmission Neurotransmitter

The Stage: Presynaptic cell Synapse Postsynaptic Cell

The Characters: Voltage-gated Ca 2+ channels Synaptic vesicles Neurotransmitters (NT) Receptors Action Potential Reuptake Transporters Ca 2+ sensitive proteins

How do the characters work together to complete synaptic transmission? Card Sort Activity

The Play: 1. Action Potential

The Play: 1. Action Potential 2. Voltage-gated Ca 2+ channels open.

The Play: 1. Action Potential Ca Voltage-gated Ca 2+ channels open. 3. Ca 2+ flows into cell

The Play: 1. Action Potential Ca Voltage-gated Ca 2+ channels open. 4. Ca 2+ sensitive proteins fuse synaptic vesicles to membrane. 3. Ca 2+ flows into cell

The Play: 1. Action Potential Ca Voltage-gated Ca 2+ channels open. 4. Ca 2+ sensitive proteins fuse synaptic vesicles to membrane. 3. Ca 2+ flows into cell 5. NTs are released into synaptic cleft

The Play: 1. Action Potential Ca Voltage-gated Ca 2+ channels open. 6. NTs bind to postsynaptic receptors. 4. Ca 2+ sensitive proteins fuse synaptic vesicles to membrane. 3. Ca 2+ flows into cell 5. NTs are released into synaptic cleft

The Play: 1. Action Potential Ca Ion channels open on postsynaptic membrane, allowing ions to flow into cell. 2. Voltage-gated Ca 2+ channels open. 6. NTs bind to postsynaptic receptors. 4. Ca 2+ sensitive proteins fuse synaptic vesicles to membrane. 3. Ca 2+ flows into cell 5. NTs are released into synaptic cleft

The Play: 1. Action Potential Ca Ion channels open on postsynaptic membrane, allowing ions to flow into cell. 8. Excess NTs are degraded by enzymes or pumped back into presynaptic cell. 2. Voltage-gated Ca 2+ channels open. 6. NTs bind to postsynaptic receptors. 4. Ca 2+ sensitive proteins fuse synaptic vesicles to membrane. 3. Ca 2+ flows into cell 5. NTs are released into synaptic cleft

What would happen if… You took a drug that destroyed the Ca 2+ sensitive proteins that fuse synaptic vesicles to the membrane??? You wouldn’t be able to release synaptic vesicles.

That’s How Botox Works! Before After Botox destroys the proteins that fuse synaptic vesicles with the membrane. By stopping vesicle release, Botox prevents muscle contraction which prevents wrinkles!

Synaptic Transmission 1. Action Potential 2. Voltage-gated Ca 2+ channels open. Ca 2+ flows into cell Ca NTs bind to postsynaptic receptors. 5. Ion channels open on postsynaptic membrane, allowing ions to flow into cell. 6. Excess NTs are degraded by enzymes or pumped back into presynaptic cell. 3. Ca 2+ sensitive proteins fuse synaptic vesicles to membrane, releasing NTs into synaptic cleft

Does it matter which ions flow into the postsynaptic cell? Sodium (Na + )Calcium (Ca 2+ )Chloride (Cl - ) Positive Negative