moving cellular material
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Moving Cellular Material. Chapter 2, Lesson 3. Membranes. Control the movement of materials in and out of cell. Semipermeable – only certain substances can pass through. There are many different ways for a substance to pass through the membrane. - PowerPoint PPT PresentationTRANSCRIPT
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Moving Cellular Material
Chapter 2, Lesson 3
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Membranes• Control the movement of materials in and out of
cell.– Semipermeable – only certain substances can pass
through.– There are many different ways for a substance to pass
through the membrane.• Process depends on the physical and chemical properties of
the substance.
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Passive Transport• The movement of substances through a cell
membrane– No energy– Usually small molecules (O2 and CO2)
– Depends on the amount of substances on each side of the membrane.
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Diffusion• The movement of substances from an area of
higher concentration to an area of lower concentration.
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Passive Transport - Osmosis
The diffusion of water molecules through a selectively permeable membrane. (No energy required)
Red Blood Cells
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Facilitated Diffusion
• When molecules pass through a cell membrane using special proteins called transport proteins.
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Active TransportThe movement of materials through a cell membrane using energy. (Moves from low to high concentration)
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Endocytosis
• The process during which a cell takes in a substance by surrounding it with the cell membrane.
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Exocytosis
• The process during which a cell’s vesicles release their contents outside the cell.