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Unformatted text preview: PHGY 209 Body Fluids-Textbook (only) Notes September 5, 2008 Body organization: Cells: simplest structural unit of a multicellular organism that still retain the functions characteristic of life. Cell differentiation: Specialization of a cell Four broad category of cells: 1. Muscle cells 2. Nerve cells 3. Epithelial cells 4. Connective tissue cells Muscle cells: Specialized to generate movement Nerve cells: Specialized to start and transmit electrical signals that control activities of other cells Epithelial cells: Specialized for selective secretion & adsorption of ions & organic molecules as well as offering cover/protection. Connective tissue cells: Connect, anchor and support structures of the body. Tissues: formed from similar cells (in function) aggregating together. Four general class of tissues: 1. Muscle tissues 2. Nerve tissues 3. Epithelial tissues 4. Connective tissues Extracellular matrix: Consists of extracellular fluid and proteins. Surrounds cells. Proteins includes fibers for reinforcement + carbohydrate containing proteins that function as adhesion and recognition molecule between cells. Have two functions: 1. Scaffold for cellular attachments 2. Transmit information via chemical messengers Organs: Composed of 4 kinds of tissues arranged in various proportions. Many organs are composed of small subunits known as functional units , each performing the function of the organ. (i.e. kidney nephrons) Extracellular fluid: Has two parts. One part exist in blood as plasma (20-25%). The other part (75-80%) exist as interstitial fluid (around and between cells). Plasma exchange oxygen, nutrients and wastes with interstitial fluids. Intracellular fluid:...
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- Spring '08
- connective tissue cells, cells epithelial cells, cells Muscle cells