BISC 104Lxg Lecture Notes - Lecture 5: Nervous Tissue, Integumentary System, Neuroglia

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Tightly packed cells: cover the body, line all cavities, compose the glands. Function: connect structures of body, structural support, hold organs together. Nervous tissue makes up the brain, spinal cord, and nerves. Generate nerve impulses and conduct them to other neurons, muscle cells, or glands. Allows cells to communicate by allowing small molecules and ions to pass from cell to cell. The integumentary system is composed of skin largest organ. Protects against bacterial invasion, uv radiation, and physical and chemical stress. Dermis: thicker inner layer containing nerves, blood vessels and glands. Produced by melanocytes at the base of the epidermis. Comes in two forms - yellow to red and black to brown. In tanning, melanocytes respond to uv radiation by increasing production of melanin. Different levels of melanin production account for different skin colors. Certain bones produce blood cells in the red marrow. Bones look stable and static, but they change throughout life.

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