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23 Cards in this Set
- Front
- Back
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What are Neurons? |
Basic functions of the nervous system
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Types of Neurons |
Sensory Neurons, Interneurons, Motor Neurons
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What are Ganglia |
Group of nerve cells bodies that process local, nearby region |
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Dendrites Do what? |
Receive Stimuli to send out the Axon
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Axon terminals do what? |
Release Neurotransmitter molecules, Bind to receptors to postsynaptic Membrane |
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Neurons are different in shape and sizes |
Ture |
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What are Glial Cells |
Cells of the Nervous System |
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Do Glial Cells transmit Electrical signals |
False
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How do Glial Cells Support Neurons |
Provide them with nutrition and physical support. There are more glial cells than actual neurons
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What are Astrocytes |
Blood brain barrier
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What is the Myelin Sheath |
It provides a electrical insulation that speeds up transmission of the Neuron signal. |
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What are membrane potentials? |
Any difference in voltage across a membrane surface.
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What is Resting Membrane Potential? |
The voltage across a membrane at rest |
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Neurons have a plasma membrane, is it impermeable to ions? |
Yes it is impermeable to ions.
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Neurons maintain different concentrations of ions inside and outside of cell. What generate membrane potentials? |
Ion Pumps and Ion channels |
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Ion pumps do what@ |
Move ions across concentration gradient. Pumps Na in and K out. |
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Ion Channels do what? |
Permit diffusion across membranes. Has opened and closed positions.
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What are voltage gated channels |
Open and Close to change in voltage across the plasma membrane. |
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What are chemically gated channels? |
Open or close on the presence of a specific molecule that binds to channel protein. |
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Mechanically gated channels? |
Open or close to the presence of pressure on the plasma receptor. |
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Achieving Resting Potential |
Pumps Na+ out and pumps K+ in. K+ leak out to maintain resting potential. |
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Depolarization |
Voltage Gated Na+ channels open into cell |
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Hyperpolarization |
K+ channels open into cell to |
