Please refer to the figure below of a neural action potential for questions #14-

Question

Please refer to the figure below of a neural action potential for questions #14-18 14. The image above shows an action potential in a neuron. What does the dotted line at "2" represent? A. a rising local potential B. threshold point C. hyperpolarization of the membrane D. repolarization of the membrane E. resting membrane potential 15. At "2", which voltage gated channels open first? A. calcium B. sodium C. potassium D. chloride 16. At "3", what direction does the sodium flow (through sodium voltage gated channels) across the plasma membrane of the neuron? A. inside the cell B. outside the cell C. there is no net movement of sodium at this point 17. What does "6" represent? A. a critical voltage called threshold B. hyperpolarization of the membrane C. depolarization of the membrane D. repolarization of the membrane . resting membrane potential 18. What is happening during "$" A. sodium channels are opening and sodium is rushing inside the cell B. sodium channels are opening and sodium is rushing outside the cell C. potassium channels are open and potassium is moving inside the cell D. potassium channels are open and potassium is moving outside the cell E. both sodium and potassium channels are open

Explanation / Answer

When the neuron or the nerve cell is triggered by a stimulus , many voltage changes occur inside the cell due to change in the concentration of ions .

So here :

Ans 14 : B) Threshold point

Ans 15 : B) sodium

Ans 16 : A) inside the cell

Ans 17 : B) hyperpolarization of the membrane

Ans 18 : D) potassium channels are open and potassium is moving outside the cell

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