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Phyllis Shared "Physiology" - 8 Picmonics

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Physiology

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
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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
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3 mins
Neuron Resting Potential
Characteristics
More Na+ Outside
Sodium-Potassium Pump
K+ Leaks Out
More K+ Inside
About -70mV
Voltage-Gated Sodium Channels are Closed
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2 mins
Electrical Synapse
Characteristics
Cardiac and Smooth Muscle Location
Fast Transmission
Bidirectional
Presynaptic Na+ Floods Through Gap Junction
Na+ Influx Initiates Postsynaptic Action Potential
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2 mins
Skeletal Muscle Contraction Initiation
Somatic Motor Neuron Releases Acetylcholine
Acetylcholine Causes Sodium Influx
Cell Reaches All-or-Nothing Threshold
Voltage-Gated Calcium Channels Undergo Conformational Change
Sarcoplasmic Reticulum Causes Calcium Flood
Calcium Flood Enters Myofibrils
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1 min
Skeletal Muscle Contraction Action
Characteristics
Calcium Binds Troponin
Active Site Exposed
Many Mitochondria Produce ATP
Myosin Head Binds
Power Stroke
Myosin Head Releases Active Site
ATP Consumed
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1 min
Central Nervous System (CNS)
Characteristics
Frontal Lobe
Parietal Lobe
Temporal Lobe
Occipital Lobe
Medulla Oblongata
Cerebellum
Pons
Spinal Cord
Dorsal Root Ganglia
Grey Matter
White Matter
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2 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
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2 mins

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