4. (12 points) In question 1 we are told the potential across the membrane of a

Question

4. (12 points) In question 1 we are told the potential across the membrane of a resting heart cell is-80 mV. This means that the potential inside of the cell is 80 mV less than the potential outside of thecell When thecell s electriclly active, positive charge moves from the inside of the cell to the outside of the cell. Which of the following statements is correct? A. Based on the direction of the electric field across the membrane, positive charge cannot move freely out of the cell because of the electric force alone. As a result, energy must be given to the positive ion to make this happen B. Based on the direction of the electric field across the membrane, positive charge can move freely out of the cell because of the electric force alone. The electric field does the work for the cell. C. Because of the direction of the electric field, positive ions will be trapped within the membrane. D. Neither of the statements above is correct.

Explanation / Answer

Option A is correct because direction of electric field is from outside to inside and hence we have to perform work to move a positive charge from inside to outside against the electric field force.

Related Questions

Navigate

• Browse (All)
• Browse 4
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.