26. Efmleient (fast) propagation of an action potentinl oeurs A. Thicker myelin

Question

26. Efmleient (fast) propagation of an action potentinl oeurs A. Thicker myelin B. Low C. Low axial reaistance D. High membrane conductivity E. None of the Above. 27. Membrane resistance is due to A. The phospholipid tails B. The polar head groups. C. lon channels D. Cytoplasm. E. All of the above 28. When a membrane is depolarized, the charges MUST go SOMEWHERE. So, the greater the insulation of the membrane, the better the conducting ability of the inner core of the axon. A. This means that the length constant is larger and the axial resistance is smaller. B. This means that the length constant is larger and the axial resistance is also larger C. This means that the length constant is smaller and the axial resistance is also smaller D. This means that the length constant is smaller and the axial resistance is larger. 29. Membrane capacitance is determined by: A. Membrane area. B. Axon diameter. C. Myelination. D. Size of the neuron. E. All of the above. 30. Because time is required to deposit and remove charges on the plates of a capacitor, the magnitude of the V across a capacitor in response to a current pulse depends on A. Area. B. Size of the neuron. C. Capacitance. D. Duration. E. Whether charges are positive or negative.

Explanation / Answer

Ans 26 : E) None of the above

All the choices are responsible for the efficient conduction in the neuron. The myelin sheath provides the insulation to the charge present in the interior of the cell , so that it can be transmitted ahead. The low capacitance , high conductivity and low resistance allows the signal to transmit without any major losses.

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