Chapter10MuscularSystem - I Introduction to muscles A...

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I. Introduction to muscles A. muscles and muscle contraction 1. some muscles are under conscious voluntary control 2. some muscles operate without conscious control 3. 3 common characteristics of all muscle tissue: a) can contrast and shorten in length ( movement ) b) after contraction, can relax and return to former length c) muscles are excitable so they respond to electrical or chemical signals 4. 3 types of muscles: a) skeletal muscle -attaches to bone b) smooth muscle -found in walls of hollow organs c) cardiac muscle -found only in the heart B. skeletal muscle-structure 1. attachment sites a) attach to bones b) attach to other muscles c) attach to facial skin 2. muscle shape varieties a) triangular shape -deltoids b) rectangular shape -rectus abdominis c) trapezoidal -trapezius d) spindle shape -bicep brachii 3. skeletal muscle is composed of bundles of muscle cells a) fascicles -bundles of muscle cells surrounded by connective tissue sheaths b) muscles -made up of many fascicles c) fascia -another sheath of connective tissues that wraps the entire muscle 4. tendons -extremely tough fibrous connective tissue formed by united connective tissue wrappings a) this joins muscle to bone 5. origin -stationary bone to which one kind of muscle is attached 6. insertion of a muscle -bone that moves when the muscle contracts 7. most muscles are arranged in antagonistic pairs C. skeletal muscle: observed with a microscope 1. characteristics a) tubular shape b) many nuclei per cell c) striated-black and white stripes d) length ranges between 1-30 mm 2.
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  • Fall '14
  • EricDavis
  • muscle atrophy

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