Chapter 3 Anatomy and Physiology I.docx - Chapter 3 Anatomy...

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Chapter 3 Anatomy and Physiology IThe CelloThe structural and functional unit of all living thingsoThe generalized human cell hasA plasma membrane (a fragile barrier and outer boundary)A cytoplasm (filled with organelles)Nucleus (control center of cell)except red blood cellsPlasma MembraneoPhospholipid bilayer (two layers) backbone with cholesteroloCertain proteins are found in the membraneIntegral proteinsIn lipid bilayerTransport molecules by channels or carry themSome are only on the outer portions of the cell forhormone reception.Peripheral proteinsAttached to lipid bilayerThey are enzymes, help with muscle contraction,change cell shape during cell division, and link cellstogetheroDifferent junctions are formed between plasma membranes ofsurrounding cells
Tight junctionLink cells together to prevent molecules from passingthrough the space between connected cellsDesmosomesAnchor together cells to prevent tearing of thecellular sheetGap junctionsAllow chemicals to pass through channels betweencells for communication to occur between cellsoSeveral different types of transportation occur across the plasmamembranePassive transport does not require ATP (energy)Simple diffusiono

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Term
Fall
Professor
Jones

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