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Diffusion & Osmosis, Exocytosis & Endocytosis, Active Transport & Assive Transport

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kiana jefferson

on 20 November 2012

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Transcript of Diffusion & Osmosis, Exocytosis & Endocytosis, Active Transport & Assive Transport

Diffusion & Osmosis
Endocytosis & Exocytosis
Active transport & Passive Transport Diffusion Diffusion is the process in which molecules move from an area of higher concentration to an area of lower concentration. Osmosis Osmosis is the diffusion of water molecules through a selectively permeable membrane.

Because cells cannot function properly without adequate water, many cellular processes depend on osmosis. Similarities Active Transport Active transport is The movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy. osmosis & diffussion both have to do with the movement of someting across the semi-permiable membrane. Passive Transport Passive transport is the transport of a substance across a cell membrane by diffusion; expenditure of energy is not required. Similarities they both use protein tomove the substance across the membrane. Endocytosis Endocytosis is the taking in of matter by a living cell by invagination of its membrane to form a vacuole. Exocytosis A process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane Similarities endocytosis & exocytosis both form vessicles
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