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L e a r n i n g O u t l i n e |
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Cell Animations |
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Lion Tracks |
Lion Den -> Anatomy & Physiology -> Course Info -> A&P 1 -> A&P 1 Outlines -> Cells -> CELL ANIMATIONS |
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Membrane Receptor - an important concept in human physiology- uses the lock-and-key approach (shape determines function) to allow a molecule of a particular shape to trigger a change in chemical activity |
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Golgi Apparatus. This animation shows how material moves through the Golgi system, eventually producing vesicles (perhaps secretion vesicles [SV] heading for the plasma membrane [PM]) |
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Centrosome. Notice the pair of centrioles at the center and the associated microtubules extending from the centrosome (microtubule organizing center). |
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Simple diffusion - the red particles are moving from an area of high concentration to areas of lower concentration (in this case, through channels in a membrane) |
Carrier-mediated passive transport
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Carrier-mediated passive transport =
facilitated diffusion
Similar to above model of simple diffusion, except particles move through a carrier mechanism instead of through a simple channel |
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Active transport - An energy- consuming type of carrier (notice ATP being used) transports molecules (usually to an area of higher concentration - not visible in this animation) |
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Cotransport (symport) involves more than one type of particle being transported by in the same direction at the same time by the same mechanism |
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The sodium-potassium pump (Na+-K+ ATPase) is an example of countertransport in which two kinds of particles are transported at the same time in opposite directions by the same mechanism. The Na+-K+ pump is present in all cells and is an important part of mechanisms that we'll discuss later. |
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Endocytosis is a kind of bulk transport where large amounts of material are brought into a cell. Notice the role of receptors in identifying what is "good to eat" and that membrane is removed from the plasma membrane. |
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Exocytosis is a kind of bulk transport in which large amounts of material are moved out of a cell. Notice also that new membrane is added to the plasma membrane (from the secretion vesicle) |
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This Learning Outline may be
updated or improved at any time. |
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© 1988-April, 2007 Kevin Patton ALL rights reserved This page updated 04/01/07.
