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Human Biology 2A/B 2012 Study NotesOrganization of the bodyooooooOrganism: Body systems that are all integrated into one living thing.System: A group of organs that work together for a common purpose. Forexample the respiratory system.Organs: Two or more tissues make up an organ. The lung is an example of anorgan.Tissues: Specialised cells that carry out a common function. e.g. a group ofmuscle cells make up muscle tissue.Cells: Basic unit of the body. Carry out different functions. Red blood cells,white blood cells, etc.The basic structural and functional unit of a living organism.Organelles: Structures that carry out specific functions inside a cell.Cytoplasm is a jelly-like substance that makes up the cell. This substance suspendsorganelles in the cell.oOrganelle FunctionsEndoplasmic reticulum: Membranes of E.R provide a surface for chemicalreactions to occur on.Stores and transports material. Network of channels formed by parallelmembranes. Rough: proteins Smooth: other material (molecules). Produces lipids (fats) which make up cellmembrane. Golgi body (complex): Series of flattened, membranous bags stacked uponeach other. G.A positioned near nucleus. Package, modify, secrete proteins(materials). Vesicles contain material being removed/ transported in or out. Ribosomes: Protein synthesis occurs. Contains RNA (which enables proteinproduction). Nucleus controls ribosomes. Free ribosomes : Production for cell

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