Chapter 4, Problem 9E

Summary Introduction

Introduction:

Transport through a cell membrane is the movement of ions and molecules. It could be through passive diffusion or active transport. While active transport is a type of transport in which the ions move from low concentration to high. It requires metabolic energy (ATP molecules). These both type of transport help in the movement of ions across the cell membrane (in or out of the cell). For example, transport in the sodium-potassium pump. In this case, the sodium ions move outside of the cell and potassium ions move inside of the cell.