1. The resting potential of a particular nerve cell is -66 mV. Depolarization of
ID: 209296 • Letter: 1
Question
1. The resting potential of a particular nerve cell is -66 mV. Depolarization of the membrane will shift the membrane potential toward A) -90 mV B)-66 mV C) 40 mV D) There will be no change E) There is not enough information to tell. 2. Of all of the ions associated with generating the resting membrane is the most potential, the permeability of the membrane to important A) sodium ions B) potassium ions C) chloride ions D) all of the above E) none of the above Base your answers to the following question(s) on the graph below, depicting an action potential 70m Figure 13.1 3. In the graph above, the point at which the potassium channels open is indicated by the letter A) between A and B B) between B and C C) between A and D D) Between C and ID E) between D and E 4. Based on the graph above, the threshold voltage appears to be approximately A) 60 mV. B) 30 mV C) 0 mV D) -30 mV E)-60 mVExplanation / Answer
1. The answer to the question will be option (c) 40 mV.
Explanation:- during testing stage inside of the nerve cell is negative due to more negatives charged molecules. So during depolarization sodium ions enter into the cell and neutralize the -60 mV , make the inside of the cell positively charged.
2. The answer to the question will be option (B) Potassium ion.
Explanation :- the resting potential is achieved by mostly by Na+ - K+ pump which pump 3 Na+ outside and 2 K+ inside. There is also a leak channel which is potassium leak channel through which potassium ion can leak even in resting membrane.
- The K+ channel may also leak sodium ions slightly but are far more permeable to potassium than sodium , normally about 100 times as permeable.
- So the permeability of the cell membrane to potassium is important.
3. The answer to the question will be option (C) between C and D.
Explanation:- Between C and D the phase is repolarization. During this phase the potassium channel opens.
4. The answer to the question will be option (E) -60 mV
- The threshold potential is -60 mV. At this potential depolarization of the cell starts.
Hopefully it helps thanks.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.