MCELLBI 32 Lecture Notes - Lecture 9: Axon Hillock, Axon Terminal, Cell Membrane
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28 Sep 2018
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Mcb lecture #9: neuron structure, cell body (soma): integrates incoming signals and generates outgoing signal to axon, dendrites: collect electrical signals, axon: passes electrical signals to dendrites of another cell or to an effector cell. Initial statement: where the electrical signal is generated: axon hillock, axon terminals, synapse: where neurotransmitter is released and where other cell receives. Chemical force: where is the ion more concentration, the chemical force points from most concentrated to less concentrated. Electrical force: opposite charges are attracted, same chargers are repelled, what is the charge of the ion, a positive ion will be attracted into a cell with negative vm, the membrane potential of the cell is -70mv. The electrical force no na+ is pointing ? the cell. The electrical force on cl- is pointing ? the cell: into, out, the equilibrium potential for ion x- is ex = -60mv and the membrane potential of the cell is vm = -50mv.
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Which of the following statements is FALSE? (choose one)
A. | Voltage-gated sodium (Na+) channels open in the dendrites and cell body during a local, graded potential. |
B. | During repolarization, potassium ions are leaving the cell (K+ is diffusing out of the cell), and the inside of the cell becomes more negative |
C. | If someone damaged an efferent motor neuron, they could feel pain, but not respond to move away from the pain |
D. | Myelin serves as electrical insulation and increases the speed at which an action potential travels along the axon |
E. | Movement of ions can be excitatory (if sodium ligand-gated channels bind the neurotransmitter), or inhibitory (if potassium ligand-gated channels bind the neurotransmitter) |