Health Sciences 2300A/B Chapter Notes - Chapter 2: Ldl Receptor, Extracellular Fluid, Lipid Bilayer
4 Aug 2017
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Document Summary
Cells = basic living, structural and functional units of the body: can survive independently for long periods of time. Human body 100 trillion cells, 200 diff types: coordinated function = fulfill structural role, numerous chemical reactions, compartmentalization keeps reactions separate. Selective barrier regulates movement of materials in and out. Role in communication between cells and their external environment: cytoplasm. All cellular components between plasma membrane and the nucleus. Each w specific function and shape: nucleus. Chromosome (single molecule of dna) contains hereditary material called genes > control cellular structure and function. Barrier that surrounds and contains the cytoplasm of a cell: fluid mosaic model. Mosaic- many different proteins (float freely or anchored) Lipids- act as barrier to the passage of substances in and out of cell. Proteins- act as gatekeepers regulating molecules and ions going in and out. Lipid bilayer (two layers) composed of: phospholipids, cholesterol, glycolipids: membrane proteins: - integral.
