Diffusion and Osmosis. KEY CONCEPT Materials move across membranes because of concentration differences.

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Presentation transcript:

Diffusion and Osmosis

KEY CONCEPT Materials move across membranes because of concentration differences.

Passive transport does not require energy input from a cell. Molecules can move across the cell membrane through passive transport. There are two types of passive transport. osmosis diffusion

Diffusion and osmosis are types of passive transport. Molecules diffuse down a concentration gradient. 3.4 Diffusion and Osmosis

Diffusion and osmosis are types of passive transport. Osmosis is the diffusion of water molecules across a semipermeable membrane.

Diffusion and osmosis are types of passive transport. There are three types of solutions. isotonic hypotonic hypertonic

Some molecules can only diffuse through transport proteins. Some molecules cannot easily diffuse across the cell membrane. Facilitated diffusion is diffusion through transport proteins.

Biology textbook video C:\Program Files\McDougal Littell\Power Presentations-Biology\START Power Presentations.html

KEY CONCEPT Cells use energy to transport materials that cannot diffuse across a membrane. 3.5 Active Transport, Endocytosis, and Exocytosis

Active transport requires energy input from a cell and enables a cell to move a substance against its concentration gradient. Passive transport requires no energy from the cell. Active transport is powered by chemical energy (ATP). Cells use active transport to maintain homeostasis. Active transport occurs through transport protein pumps.

A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. Cells use energy to transport material in vesicles. Endocytosis is the process of taking material into the cell. Phagocytosis is a type of endocytosis.

A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. Cells use energy to transport material in vesicles. Exocytosis is the process of expelling material from the cell.

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