carryon

A cell is placed in saltwater solution of 0.2 mM NaCl. Neither Na+ nor Cl- can permeate the plasma membrane. What happens to the cell? Assuming that = +60 mV, = -90 mV, and = -70 mV, find the direction of the electrochemical driving forces acting on Na+ and Cl- ions. In which direction will the ions move if they are transported passively? If they are transported actively?(Extra challenge: From the sign of , determine the direction of the concentration gradient of Cl- ions.) Please explain how you got the answer so I can do a similar one on my own Explain the mechanism of glucose absorption by intestinal epithelial cells. Include a discussion of the significance of cellular polarity. Ion channels can be regulated to open or close, changing the permeability of the membrane to a specific ion. Assume that a cell at a membrane potential of -70 mV has few open sodium channels. Knowing that the equilibrium potential for sodium is +60 mV, predict what would happen to the membrane potential if many sodium channels suddenly went from a closed state to an open state. Explain your answer. Oubain is a drug that blocks the Na+/K+ pump. Describe and explain the effects you would expect oubain to have on (1) sodium concentration gradients across cell membranes, (2) potassium concentration gradients across cell membranes, and (3) movement of molecules by secondary active transport coupled with sodium. Please answer what you know. I'm struggling with those questions even though I read all the chapter and took notes