6. A resting membrane is only permeable to one ion and has a membrane potential

Question

6. A resting membrane is only permeable to one ion and has a membrane potential of -80mV Assume that the relative concentrations of ions across membrane are the same as that of typical cells. You conclude that this membrane may be permeable to A. Na B. K C. Ca2 D. C 7. The resting membrane potential of a typical neuronal cell membrane is about A. -80mV B. -65mV C. -40mV D. +40 mV (3 points) If a membrane goes from -40mV to -65mV, we call this membrane depolarized or hyperpolarized? What could have caused it? Ca2* has a ratio of out: in (relative concentration of outside and inside the membrane) 1:10,000 across a synthetic membrane. What is the equilibrium potential of Ca2*? 8. (61.5) (Hint: Use the Nernst equation A. -123 mV B. -80 mV C. 62 mV D. 123 mV 9· If we increase the amplitude of an electrical current when stimulating a neuron, what will appen to the action potentials that are generated? A. B. C. D. The amplitude of the action potentials will increase The frequency of the action potentials will increase Both A and B Nothing will change 10. Between two typical cells, a neurotransmitter binds to its receptor which is a chloride channel As the result, the chloride channel is open. This neurotransmitter is said to be A. Inhibitory B. Excitatory C. Inhibitory or excitatory D. Needs more information

Explanation / Answer

6 Ans: Na+

7 Ans.: D +40mV

if a membrane goes from -40mV to -65mV.We call this membrane DEPOLARIZED.

9 ans: A

the amplitude of the action potential will increase

10 ans : inhibitory

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