XI - XII Cell Inclusions A Structure Structure of the Cell...

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Structure of the Cell XI. Cytoskeleton A. Microfilaments 1. 6 nanometers in diameter 2. made up of subunits called actin (myosin in muscle) 3. support and cell shape 4. movement a. muscle contraction b. white blood cells (phagocytes) B. Intermediate Filaments 1. 8-12 nanometers in diameter 2. support, shape, some intracellular movement 3. best studied: in nerve cells (neurons) 4. possible role in Alzheimers, other neuro disorders C. Microtubules 1. ~24 nanometers in diameter 2. made up of subunits called tubulin 3. involved in intracellular transport a. move organelles around like a highway 4. involved in amoeboid motion of cells (phagocytes) 5. chief components of cilia and flagella (see below) D. Microtrabecular Lattice 1. framework of all components working together 2. the skeleton that supports/organizes the cell E. Cilia and Flagella 1. both consist of microtubules (9+2 arrangement) 2. flagella very large for cell locomotion (sperm) 3. cilia very small, fingerlike projections a. epithelium of respiratory tract b. lining of digestive tract (intestinal villi)
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Unformatted text preview: XII. Cell Inclusions A. Structure Structure of the Cell 1. conglomeration of molecules of same type 2. melanin- pigment in skin, hair, eyes 3. glycogen- glucose storage - liver and muscles 4. lipids- stored in fat cells (longterm energy) XIII. Extracellular Materials A. Different Types 1. interstitial (extracellular) fluid 2. plasma - liquid portion of blood 3. secretory material (mucus, saliva, sweat) 4. extracellular matrix (binding cells into tissue) B. Amorphous Extracellular Components (jelly-like) 1. hyaluronic acid- binding, lubrication, shape (eyes) 2. chondroiton sulfate- cartilage, bone, vessels 3. dermatin sulfate- skin, tendons, heart valves 4. keratin sulfate- bone and cornea C. Fibrous Extracellular Components (thread-like) 1. collagen - primary subunit of fibrous components 2. collagenous fibers- bone, cartilage, tendon, ligs. 3. reticular fibers- fat, muscle, nerve, vessels 4. elastic fibers- (elastin) skin and blood vessels-----------------------------------------------------...
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XI - XII Cell Inclusions A Structure Structure of the Cell...

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