Muscle tissue 1

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Types of muscle and functional characteristics of muscle. Levels of organization of muscle, fascicles, myofibrils, and myofibers. Microanatomy and functional unit of contraction, the sarcomere. Used as basis for lecture to high school science students

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Muscle tissue 1

  1. 1. Muscle Tissue 1 Muscle types and functional characteristics Levels of organization and microanatomy of muscle
  2. 2. The basics Muscles are attached to bones Muscles contract (get shorter) and move bones Muscles comprise 40-50% of body mass Myology Study of muscle anatomy and physiology Myo- Mys- Sarco- = prefixes that reference muscle
  3. 3. Muscle functional characteristics Excitable / excitability ability to respond to stimuli Contractile / -ility ability to shorten; initiated by nerve signal (action potential) Extensible / -ility ability to stretch; lengthen Elastic / -icity ability to return to original length
  4. 4. Types of muscle Skeletal Attached to bones, striated, voluntary Cardiac Forms heart, striated, involuntary Smooth Walls of blood vessels, stomach intestines, hair follicles, nonstriated, involuntary
  5. 5. Muscle Functions Motion contraction moves bones; body blood flow peristalsis (squeezing of intestines) gall and urinary bladder contraction Posture maintenance / joint stabilization Thermoregulation contraction results in heat energy release
  6. 6. Skeletal muscle contraction (microanatomical TEM)
  7. 7. Skeletal muscle tissue organization
  8. 8. Connections Tendons Dense connective tissue continuous with deep fascia, connect muscles to periosteum Aponeuroses Broad flat tendon attachment to bone, or to different muscle, or skin
  9. 9. Microanatomy
  10. 10. Muscle Contraction Requirements Nerve impulse A nerve penetrates every muscle Synaptic bulb / neuromuscular junction = muscle connection with nerve cell Blood Supplies energy, nutrients, oxygen Removal of waste and heat Each muscle fiber is in contact with capillaries

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