BIOLOGY 2A03 Chapter Notes -Sensory Neuron, Tubular Fluid, Proximal Tubule
26 Sep 2013
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Branched to receive or transmit signals: muscle cells, skeletal muscle- arms/legs (voluntary, cardiac muscle- heart (involuntary, smooth muscle- blood vessels (involuntary, epithelial cells. Continuous sheet-like layer of cells w/ a thin underlying layer of non-cellular material called a basement membrane layers can be thick and cells have diff shapes/sizes: connective tissue cells. Tissue is made of cells + extracellular matrix (non-cellular materials) with elastin (for elasticity) and collagen (for strength and resist stretching); most diverse. Lumen- interior cavity of a hollow organ or vessel. Internal envmt- fluid that constitutes the immediate envmt of most cells. Most cells are not in direct contact w/ external envmt (like the blood vessels) or w/ the bloodstream (like the nerve or muscle cells) Internal envmt and external envmt are separated by a single layer of continuous epithelial tissue (lec 2, slide 2): skin, linings of lung, gastrointestinal system and kidney tubules.
