Cell Transport Cell Transport Return to Cell Structures and Functions , or 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. Cell structure chart , Cell Comparison Lab , Cell diagrams , Cell Theory , Cell Discoveries Activity , Comparing Levels of Organization , History of the Microscope , Levels of Organization , Microscope Handling , Microscope Observations Tips , the Parts of a Microscope, and Preparation of a Microscope Slide . Return to the 7th Grade Integrated Science Sci-ber Text Page .