Q&A Hero

Q: 43. The sodium-potassium (Na+-K+) pump transports both sodium and potassium __________ their concentration gradients in a process called ____________. A. up; active transport B. up; facilitated transport C. up; cotransport D. down; active transport E. down; countertransport

Q: Which of the following is not a function of the Na+-K+ pump? A. Heat production B. Transport of Na+ into the cell and K+ out of the cell C. Secondary active transport D. Regulation of cell volume E. Maintenance of membrane potential

Q: Blood Ca2+ deficiency stimulates __________ secretion, which leads to __________. A. calcitonin; more urinary phosphate reabsorption B. calcitriol; more urinary phosphate excretion C. parathyroid hormone; increased osteoclast activity D. growth hormone; increased osteoblast activity E. thyroid hormone; less urinary calcium excretion

Q: When the voltage of a plasma membrane shifts from +35mV towards 0 mV, the cell is __________. A. depolarizing B. repolarizing C. hyperpolarizing D. reaching the threshold E. exiting the threshold