16 Skeletal muscle

16 Skeletal muscle - Biology141 (Physiology) 4/6/08 1:04 AM...

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4/6/08 1:04 AM Biology141 (Physiology) Page 1 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%2016(2008).htm Biology141 (Physiology) Lecture 16 M. Whim SKELETAL MUSCLE [1]. STRUCTURE OF SKELETAL MUSCLES. skeletal muscles are attached at each end to bones by tendons . contraction of muscle shortens tension on bones movement at a joint. (a). Cellular structure of skeletal muscles. a muscle is composed of a collection of muscle cells. each muscle cell ( fiber ) is surrounded by a cell membrane. what special features do muscle cells contain? do they also contain the usual cellular organelles? (b). Motor units. a motor neuron + all its innervated muscle fibers = motor unit. what transmitter do somatic motor neurons (MN) secrete and what type of receptor on the muscle (M.) cells is activated? cell body of MN is in the ventral horn of the spinal cord . each MN innervates
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16 Skeletal muscle - Biology141 (Physiology) 4/6/08 1:04 AM...

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