Biology Lesson 7.7

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Biology Lesson 7.7

  1. 1. Lesson 7.7 Muscle Strength/Weakness Keeping muscle healthy isimportant because injury results in reduced muscle strength.
  2. 2. Hypertrophy - enlargement ofa muscle through use.Atrophy – the degeneration ofmuscle due to lack of use.
  3. 3. All muscles containmitochondria (energy) and myoglobin (oxygen).Myoglobin gives meat its red color.
  4. 4. Types of Muscle fibersA. Red muscle fibersContains lots ofmitochondria and myoglobin.Contraction is slowknown as slow-twitch fibersHas great endurance(marathon runner) (chickenlegs)
  5. 5. Types of Muscle fibersA. Red muscle fibersB. White muscle fibers fewer mitochondria andmyoglobinContract quickly calledfast-twitch fibers.fatigue quickly becausefewer mitochondria(sprinter) (chicken breast)
  6. 6. •Most muscles are acombination of both redand white.•Red used mostly but ifneed rapid and forcefulmovement the white arestimulated.
  7. 7. Can train your musclesaccording to whether youwantstrength, endurance, orspeed.Important to warm youmuscles up and cool themdown.
  8. 8. Muscle strainswhen you tear a tendon due toover workusually heals fine
  9. 9. Muscle fatiguewhen muscle becomes stiff, soreand difficult to contractoccurs do to excessive useoccurs because of anaerobicrespiration and lactic acid build up
  10. 10. Muscle crampssudden and painful involuntarycontraction of musclePossibly resulting from ATPstorage
  11. 11. Muscle Toneis a state of slight musclecontraction even when at restkeeps muscles from sagging andready for action
  12. 12. Note: The muscular, skeletaland nervous system allfunction together to makemotion possible.A Divine Design!!!

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