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9.1 Tissues And Organs

9.1 Tissues And Organs - Biology141(Physiology 1:02 AM...

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4/6/08 1:02 AM Biology141 (Physiology) Page 1 of 2 https://courses.bio.psu.edu/spring2008/biol141/lecture%209%20additional%20material%20(2008).htm Biology141 (Physiology) M. Whim TISSUES AND ORGANS TISSUES 4 primary tissues of the body (each with a characteristic structure and function). [1]. MUSCLE TISSUE. (a). Skeletal muscle graded contractions produce movements of the skeleton. (b). Cardiac muscle no graded contractions of the heart. (c) Smooth muscle found in digestive tract, blood vessels etc. circular arrangement around a cavity peristalsis. [2]. NERVOUS TISSUE. (a). Neurons communicate by electrical signals (action potentials). most are post-mitotic (i.e. they don’t replicate so if lost can’t be regained). (b). Glia don’t fire action potentials. serve to modify extracellular environment and to influence electrical activity. can replicate to a limited extent. many more glial cells than neurons. [3]. EPITHELIAL TISSUE. the cells that membranes that cover the body surfaces and of glands that are derived from the membranes.
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