Cell Transportation Page Materials move into and out of cells through either passive transport or active transport.
Passive transport includes diffusion and osmosis.
Molecules tend to move from crowded to less crowded in order to achieve a balance or to reach homeostasis. The cell membrane is selectively permeable which allows the movement of substances, especially oxygen, water, food molecules, carbon dioxide, and waste products, into or out of the cell. Movement occurs when there are unequal concentrations of a substance inside and outside of the cell. Visit the Utah State 7th Grade Integrated Science Core Curriculum Page . USOE Home Page Copyright by the Utah State Office of Education.