Assume a cell with the following conditions.
K+ Equilibrium Potential = -81 mV
Na+ Equilibrium Potential = +58 mV
The plasma membrane of the cell is permeable only toK+
The membrane potential is constant over time
Which of the following statements is/are correct?
| a. | The cell must expend energy to maintain a K+ concentrationgradient. |
| b. | The membrane potential is -70mV. |
| c. | The rate of K+ exiting the cell is equal to the rate of K+entering the cell. |
| d. | both a) and b) are correct, and c) is incorrect |
| e. | a), b) and c) are all correct |
Which of the following statements is/are correct for anendotherm when ambient temperature decreases below thethermoneutral zone?
| a. | The driving force for heat loss to the environment increases |
| b. | Unit metabolic rate increases |
| c. | Body temperature decreases in proportional with ambienttemperature |
| d. | both a) and b) are correct, and c) is incorrect |
| e. | a), b) and c) are all correct |
