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Published byMilo Hines Modified over 9 years ago
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A cell is a factory: an organism must obtain energy, raw materials, and eliminate waste. These functions keep cells healthy so they can grow through cell division. Cell growth allows cells to divide, therefore growing and repairing tissue as needed.
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Particles naturally travel from crowded areas (dense) to less dense places. Diffusion is the process by which molecules spread from areas of high concentration, to areas of low concentration. When the particles are even throughout a space - it is called EQUILIBRIUM Diffusion
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MOLECULES MOVE FROM AREAS OF HIGH CONCENTRATION TO AREAS OF LOW CONCENTRATION.
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Cells are surrounded by and filled with mostly water. Diffusion of water is so important that it was given a special name – Osmosis. Pure water has the highest concentration of water molecules.
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Pure Water would rush into a Red Blood Cell Plasma – would maintain the Red Blood Cells Salt solution would shrink the Cells
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Particles move through channels (protein cells). Diffusion and Osmosis are examples of Passive Transport - Thus no Energy is used for particles to move (High- Low) through a membrane.
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Active Transport usually involves the movement of small particles from an area of low concentration to an area of High concentration. Thus using Energy to perform this process.
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Large Particles use Active Transpor t to move in and out of cells
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Reverse Osmosis is a process that forces water across semipermeable membranes under high pressure. The high pressure reverses the natural tendency of the solutes to travel from high to low concentration areas – this is how water is purified.
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Cell comes in contact with particle Cell membrane begin to wrap around particle The particle is completely surrounded – vesicles pinch off. Endocytosis means “within the cell”
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Three Types: Phagocytosis, Receptor- Mediated and Pinocytosis. Phagocytosis – captures large particles by sending out pseudopods (false feet) Receptor Mediated – receptors on the membrane captures specific substances before endocytotic process begins. Pinocytosis – the cell membrane usually surrounds a substance – forming a vesicle to carry it into the cell.
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Large particles are packaged in vesicles to leave the cell Vesicle travels to membrane wall and fuses. Cell releases the Vesicle Exocytosis means “Outside the Cell” Materials discharged from cell (vacuole passes plasma membrane to dump contents out of cell).
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Plants use the energy captured by chlorophyll to change carbon dioxide and water into food. Glucose is a carbohydrate used by plants to convert sunlight into stored sugars (Energy).
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Cellular Respiration uses oxygen to breakdown food.
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Photosynthesis: Uses Sunlight Energy and CO 2 to make Glucose and releasing O 2 Cellular Respiration: Cells use O 2 to breakdown glucose and Releases CO 2.
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