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Physiology | Physician Assistant (PA) School Study Aid
Electrical Synapse
- Characteristics
- Cardiac and Smooth Muscle Location
- Fast Transmission
- Bidirectional
- Presynaptic Na+ Floods Through Gap Junction
- Na+ Influx Initiates Postsynaptic Action Potential
2 mins
Chemical Synapse
- Voltage-Gated Calcium Channels Open
- Ca2+ Influx
- Vesicle-Membrane Fusion
- Exocytosis of Neurotransmitter
- Neurotransmitter Binds Post-Synaptic Receptors
- Neurotransmitter Breakdown
- Neurotransmitter Reuptake
1 min
Neuron Resting Potential
- Characteristics
- More Na+ Outside
- Sodium-Potassium Pump
- K+ Leaks Out
- More K+ Inside
- About -70mV
- Voltage-Gated Sodium Channels are Closed
2 mins
Neuron Action Potential Initiation
- Characteristics
- Summation of Signals
- -50 mV Threshold Value Reached
- Voltage-Gated Sodium Channels Open
- Local Depolarization
- Na+ Influx
- Potassium Channels open
- Repolarization
2 mins
Neuron Action Potential Propagation
- Characteristics
- Unidirectional Depolarization
- Absolute Refractory Period In Preceding Na+ Channels
- Neighboring Voltage Gate Channels Open
- Nodes of Ranvier
- Myelination Increases Propagation Speed
- Saltatory Conduction
3 mins
Autonomic Nervous System
- Characteristics
- Sympathetic Nervous System
- Fight or Flight
- All Preganglionic Neurons Release Acetylcholine
- Sympathetic Postganglionic Neurons Release Norepinephrine
- Antagonistic Effects of Sympathetic and Parasympathetic Nervous Systems
- Parasympathetic Nervous System
- Rest and Digest
- Parasympathetic Postganglionic Neurons Release Acetylcholine
2 mins
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