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24 Cards in this Set
- Front
- Back
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The Axon
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Dendrites
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The Nodes of Ranvier
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A Schwann Cell
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Myeline sheaths
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Describe Membrane Potential
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Fundamental property of all cells resulting from an excess of negative charge on the inside of the cell
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What ions are of greater concentration inside the neuron?
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anions that include proteins, and RNA. Potassium K+ cations are also present
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What ions are of greater concentration outside the neuron?
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Cations Sodiun Na+, and Calcium Ca++. Also Cloride Cl- anions.
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What is the resting membrane potential for a neuron?
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-60mV
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How many types of ion channels are there?
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3 - Voltage Gated
Ligand Gated Stress Activated |
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Ligand Gated ion channels are controlled by?
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Molecules
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Stress activated ion channels are controlled by?
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Membrane structure
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An example of a stress activated ion channel.
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Auditory sensory cells found in the ear.
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What substance blocks the binding of adenosine?
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Caffeine
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What substance blocks the binding of dopamine?
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Cocaine
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What substance binds to the receptors for enkephalins?
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Morphine
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What substance blocks the reuptake of serotonin?
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Prozac
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What neurotransmitter is used in muscle cells?
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Acetylcholine
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Besides being used in the muscles as a neurotransmitter, what other function can acetylcholine have?
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As a neurotransmitter for neuron to neuron communication.
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Ligand-Gated ion channels are found in what part of the neuron?
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In the dendrites and cell body.
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Voltage gated ion channels are found in what part of the neuron?
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Na+ and K+ channels are found in the axon while Ca+ channels are found at the axon tip.
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At resting potential what is the only ion channel open on the neuron?
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The K+ leak channels
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What is the threshold potential of a neuron?
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-40mV
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What is the action potential of a neuron?
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+40mv
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