diffusion and osmosis
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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. diffusion. - PowerPoint PPT PresentationTRANSCRIPT
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Diffusion and Osmosis
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KEY CONCEPT Materials move across membranes because of concentration differences.
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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
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Diffusion and osmosis are types of passive transport.
• Molecules diffuse down a concentration gradient.
3.4 Diffusion and Osmosis
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Diffusion and osmosis are types of passive transport.
• Osmosis is the diffusion of water molecules across a semipermeable membrane.
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Diffusion and osmosis are types of passive transport.
• There are three types of solutions.
• isotonic
• hypotonic
• hypertonic
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Some molecules can only diffuse through transport proteins.
• Some molecules cannot easily diffuse across the cell membrane.
• Facilitated diffusion is diffusion through transport proteins.
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Biology textbook video
• C:\Program Files\McDougal Littell\Power Presentations-Biology\START Power Presentations.html
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KEY CONCEPT Cells use energy to transport materials that cannot diffuse across a membrane.
3.5 Active Transport, Endocytosis, and Exocytosis
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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.
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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.
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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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Biology textbook presentation
• C:\Program Files\McDougal Littell\Power Presentations-Biology\START Power Presentations.html
• United streaming: http://player.discoveryeducation.com/index.cfm?guidAssetId=EE86FD99-F075-49FD-BBDC-61DE73CA949F&blnFromSearch=1&productcode=US