active transport. The movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is, from an area of lower concentration to one of higher concentration. Active transport requires the assistance of a type of protein called a carrier protein, using energy supplied by ATP.
Wuwheuwuwhwhw. The answer is c
Important muscle electrical signals is the movement of charged material (ions) across cellular membranes in a limited area
As you move down a group, atomic radius increases
