Biophysics 3 PDF - Electrical Properties of Neuron

# Chapter one: electrical properties of neuron ## Lecture Two ### Choose the correct answer: **[1] the arrow on the next figure represents** * (a) Polarization * (b) Depolarization * (c) Repolarization * (d) hyperpolarization **[2] the arrow on the next figure represents** * (a) Polarization * (b)...

# Chapter one: electrical properties of neuron ## Lecture Two ### Choose the correct answer: **[1] the arrow on the next figure represents** * (a) Polarization * (b) Depolarization * (c) Repolarization * (d) hyperpolarization **[2] the arrow on the next figure represents** * (a) Polarization * (b) Depolarization * (c) Repolarization * (d) hyperpolarization **[3] when the cell membrane potential equals to -55 mV represents** * (a) Hyperpolarization * (b) Polarization * (c) Repolarization * (d) Depolarization **[4] when the cell membrane potential equals to -70 mV represents** * (a) Hyperpolarization * (b) Polarization * (c) Repolarization * (d) Depolarization **[5]** * a represents (Subthreshold) * b represents (Action Potential) * c represents (Threshold) * d represents (Resting Potential) **[6] when the stimuli is not sufficient to reach the threshold value, the cell membrane will undergoes** * (a) Hyperpolarization * (b) Polarization * (c) Repolarization * (d) Depolarization ___ ## Chapter one: electrical properties of neuron ### True or False 1. A separation of electrical charge exists across plasma membranes of most cells. This is known as a membrane potential. **T** 2. The membrane potential provides an electrical force that can influence the movement of ions through their channels across a plasma membrane. **T** 3. The direction and magnitude of ion fluxes across membranes depend on both the concentration difference and the electrical difference. **T** 4. Nernst equation can be used to determine the value of the potential difference across the cell membrane. **T** 5. Nernst equation takes into account the effect of the permeability value in the potential difference determination across the cell membrane. **F** 6. Goldman-Hodgkin-Katz Voltage equation (GHK) can be used to calculate the potential difference across the cell membrane. **T** 7. The negative sign of the resting potential value is relative to the inside of the cell and is due to the excess negative charges on the inside of the cell membrane. **T** 8. Local potential changes are graded; This means that the degree of change in the resting potential is directly proportional to the intensity of the stimulation. **T** 9. If a neuron is sufficiently depolarized, the membrane potential reaches a level called the threshold potential, which is approximately -55 millivolts in a neuron. **T** 10. If a neuron is sufficiently depolarized, the membrane potential reaches a level called the threshold potential, which is approximately -70 millivolts in a neuron. **F** 11. the next figure represents the resting potential case. **True** 12. The next figure represents the polarized case of the membrane. **True** 13. The next figure represents the depolarized case of the membrane. **True** 14. The next figure represents that Na ion channels open and K ion channels closed. **True** 15. The figure represents an impulse processing called Convergence. **True** 16. The figure represents an impulse processing called divergence. **True** 17. In the electrical model of the neuron, the myelin sheath represented by a capacitor. **T**