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Week 7 SCI221
Chapter 19 - Nerve Signaling
| Question | Answer |
|---|---|
| What is the resting membrane potential of most neurons? | Around -70mV |
| How is the resting membrane potential maintained? | The sodium/potassium pump and selective K+ permeability |
| What causes a local potential? | A stimulus (electrical, chemical, or mechanical) which opens gated ion channels |
| Difference between depolarization, repolarization, and hyperpolarization? | Stages of action potential - depolarization = cell becomes less negative - repolarization = return to a negative charge - hyperpolarization = brief phase where cell becomes more negative than resting potential |
| What is the threshold for an action potential? | Around -55mV |
| what is "all-or-none" principle? | A nerve will respond to a stimulus completely or not at all |
| What is the absolute refractory period? | Brief period after nerve or muscle cells fire action potential and another one is not possible |
| What is saltatory conduction? | When an action potential jumps from node to node along a myelinated axon for rapid conduction |
| Important parts of synapse? | - presynaptic terminal - synaptic cleft - postsynaptic membrane |
| Difference between EPSP and IPSP? | EPSP = depolarization (Na+ entering cell) IPSP = hyperpolarization (Cl- entering or K+ leaving) |
| Four types of neurotransmitters? | - amino acids - monoamines - peptides - acetylcholine |
Created by:
carolina182
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