In the human body, most cells take in very small amounts of iodine. Cells of the thyroid gland, however, depend on much higher iodine concentrations. Which method of transportation would you predict thyroid cells use to take in iodine?

six grader is what i am ssorry

energy and particles

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

and after water is usually warmed by the sun the water temperature raises and then evaporates .