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Muscle Contraction

Muscle Contraction. This simple process occurs in just a few thousandths of a second!!! Summary New Summary:McGraw Hill Video Showing AChE PROJECT TIME!!! Student Example Beth Dietzen: Prezi Sam B photostory Prezi Youtube rap (in email a & p - bryce). Contraction of a Skeletal Muscle.

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Muscle Contraction

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  1. Muscle Contraction This simple process occurs in just a few thousandths of a second!!! • Summary New Summary:McGraw Hill • Video Showing AChE PROJECT TIME!!! • Student Example • Beth Dietzen: Prezi • Sam B photostory • Prezi • Youtube rap (in email a & p - bryce)

  2. Contraction of a Skeletal Muscle • “all or none” • Different combinations • Force • Need for ATP

  3. 3 pathways to get ATP (diagram p 190) • Bonds of ATP • 4-6 seconds 1. Direct phosphorylation of ADP to ATP - Creatine phosphate (CP) - converts ADP to ATP directly • Aerobic respiration occurs in mitochondria 3. Anaerobic respiration fast but not as efficient as aerobic

  4. Muscle Fatigue and Oxygen Debt “Why do you get tired when you workout?” • Muscle fatigue: (Video: Ironman) • Used Oxygen must be “repaid”

  5. Muscle Tone and Exercise • Muscle Tone • Muscle strains/tears • Microtears = sore

  6. What is a muscle cramp? Causes?

  7. DONE

  8. Aerobic ExerciseEffects of Exercise on Muscle • Fast twitch (more CP) and slow twitch fibers (more mitochondria) • Small increase in muscle cell size • Store more oxygen • More Increase flexibility, mitochondria, coordination • Resist fatigue

  9. Resistance ExerciseEffects of exercise on muscle • Isometric • Increase connective tissue • Increase muscle cell size (myosin) and strength • More contractile filaments

  10. Both types together are BEST • Results of increased muscle use: • Increase in muscle strength and efficiency • Muscle becomes more fatigue resistant • Healthy heart (enlarges) • improves digestion • bones stronger • lungs more efficient • clear fat deposits from walls of blood vessels

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