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5 Cards in this Set
- Front
- Back
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Structure of a Motor Neurone
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Dendrites, Neurone cell body, nucleus, axon, action potential, myelin sheath made of schwan cells, nodes of ranvier, synaptic terminals of axon
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Describe a structural difference between a motor and sensory neurone.
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Cell body location. On motor neurone, it is attached to dendrites. On sensory neurone, it is located on the axon.
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Define resting potential.
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Resting potential is the membrane potential energy of a neuron membrane when not conducting an impulse. The charge of a membrane during resting potential is -70 mV, which means that the charge within the cell membrane is relatively negative (polarized) to the outside charge.
This is due to the active transport of Sodium ions out of the cell into intracellular fluid and potassium ions transported into the cytoplasm. Negatively charged organic ions are located in the cytoplasm. |
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Define action potential.
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Action potential is the state of the cell membrane while conducting an impulse, meaning the rapid depolarization and repolarization of the cell membrane. The charge on the membrane typically reaches up to +40 mV, meaning the inside of the cell is positively charged relative to the outside.
In a self-propagating wave of ion movement, active transport channels are opened and sodium ions are diffused in and potessium ions are diffused out. This sends an impulse, or action potential continuing on the axon. |
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Refractory period
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Resting potential is restored by the movement of potassium ions out of the cell. Neurone cannot respond
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