Diffusion & Osmosis

Osmosis

- diffusion of WATER molecules through a selectively permeable membrane; cells need water to perform functions properly; water "plumps up" cells; without water, cells shrink and die.

Active Transport

- molecules pass through membrane USING cell's energy; use transport proteins to move molecules OR the cell membrane engulfs or "swallows up" the molecule.

Passive Transport

- molecules pass through membrane WITHOUT using cell's energy. Diffusion and Osmosis are both examples of passive transport.

Diffusion

- small molecules move through the cell membrane; cell membrane is selectively permeable; molecules move from area of higher concentration to an area of lower concentration

Osmosis

A wilted leaf that "plumps up" again after a rainstorm is an example of...

Diffusion

Juice ingested and mixing with stomach acid is an example of...

Because of osmosis, the cabbage leaves release their water to dilute the high concentration of salt.

Mrs. Mulder makes a delicious batch of Kimchi but rubbing cabbage leaves with salt. She notices that the bowl that the cabbage leaves are in "magically" fills with water. What happened?

The scent molecules diffuse through the air until they are mixed with the air in the next room.

Someone bakes an apple pie. After about 30 minutes, people in the next room begin to smell the pie. Why?