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24 Cards in this Set

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