Cells and Tissues Web - Cells and Tissues Cells - building...

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Cells and Tissues Cells - building blocks of all life Tissues - groups of cells w/ similar structure and function
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Anatomy of the Cell Cells are not all the same All cells share general structures All cells have 3 main regions Nucleus Cytoplasm Plasma membrane Figure 3.1a
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The Nucleus Control center of the cell Contains genetic material (DNA)
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Plasma Membrane – guarded doorway of cell Double phospholipid Plasma membranes are Semi-Permeable!
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Plasma Membrane: phospholipid structure Figure 3.2 Hydrophilic (water loving) phosphate heads Hydrophobic (water fearing) tails made of lipids Makes phospholipids perfect for forming a boundary in water!
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Microvilli increase surface area of membrane Figure 3.4 Microvilli line the small intestine…help make surface area inside = 250m 2 (size of a tennis court!)
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Proteins hold membranes together… Figure 3.3 Cells membranes held together by… Tight junctions – sewn together (water tight) Desmosomes – riveted together (like buttons) Gap junctions – tiny plumbing
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Cytoplasm – stuff outside nucleus, inside plasma membrane Organelles – tiny ‘organs’ with specific functions Cytosol – nutrient rich fluid, helps secure organelles
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Homework: label and describe functions of major cell organelles/structures. Due on Friday (3/5). Do you know where to find the assignment? http://faculty.rcc.edu/galusky/
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Organelles of the endomembrane system Help manage protein manufacture and shipping
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Rough Endoplasmic Reticulum – internal membrane studded with ribosomes (protein makers) Figure 3.5, step 1 Ribosome Protein mRNA Rough ER New proteins trapped in ER.
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Rough Endoplasmic Reticulum Figure 3.5, step 2 Ribosome Protein mRNA Rough ER Protein is modified as needed. New proteins trapped in ER.
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Rough Endoplasmic Reticulum Figure 3.5, step 3 Ribosome Protein Transport vesicle buds off mRNA Rough ER Protein shipped inside vesicle Protein is modified as needed. New proteins trapped in ER.
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Rough Endoplasmic Reticulum Figure 3.5, step 4 Ribosome Protein Protein inside transport vesicle Transport vesicle buds off mRNA Rough ER Proteins travel to Golgi or cell membrane
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Cytoplasmic Organelles Golgi apparatus Modifies and packages proteins
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Figure 3.6, step 2 Extracellular fluid Plasma membrane Membrane Golgi apparatus Rough ER Pathway 1 Golgi makes: 1. Secretion vesicles that release proteins by exocytosis
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Figure 3.6, step 8 Extracellular fluid Plasma membrane Golgi vesicle containing membrane components fuses with the plasma membrane Pathway 2 Golgi apparatus Cisterna Rough ER Golgi makes: 2. New cell membrane
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Figure 3.6, step 11 Extracellular fluid Plasma membrane Golgi vesicle containing digestive enzymes becomes a lysosome Lysosome fuses with ingested substances Membrane Pathway 3 Golgi apparatus Rough ER Golgi makes: 3. Lysosomes – packets of digestive enzymes that recycle old organelles and kill pathogens
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This note was uploaded on 01/13/2012 for the course ANATOMY 10 taught by Professor Prestongalusky during the Fall '11 term at Riverside Community College.

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Cells and Tissues Web - Cells and Tissues Cells - building...

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