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Class Topics

Muscle Physiology Test Biomechanics “It is amazing what you can accomplish if you do not care who gets the credit.” Harry S. Truman. To assess learning about the physiology of muscles. Title: Anat & Phys 12/8/06 . Class Topics. Objectives:. Saturday, January 4, 2020 6:56 AM.

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Class Topics

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  1. Muscle Physiology Test Biomechanics “It is amazing what you can accomplish if you do not care who gets the credit.” Harry S. Truman To assess learning about the physiology of muscles. Title: Anat & Phys 12/8/06 Class Topics Objectives: Saturday, January 4, 20206:56 AM

  2. Finals Schedule12/15/06 - 12/21/06 • # Revised lunch schedule • Friday the bus leaves at 10:40 • Buses run at regular times – Mon, Tues, and Wed • Thursday the bus leaves at 11:00

  3. Class Assignments What By When • Muscle physiology test 12/8/06 • Due this class period • Due next class period • Due in the future

  4. Posttest Activities • Read the handout • Please don’t write on them, I need them back

  5. Biomechanics • Skeletal system and muscular system working together • Levers • 3 types of levers • 1st class • 2nd class • 3rd class

  6. Pivot Fi Force in Fo Force out Levers Fi Fi Fo Fo 2nd class 1st class Fo Fi 3rd class

  7. 1st class leverTriceps Brachii, also found in muscles of neck and head Fi Fo Increases speed and overcomes resistance

  8. 2nd Class LeverGastrocnemius Fi Fo Used to overcome resistance, move large weights

  9. F1 Fo 3rd Class LeverMasseter and temporalis with the mandible, also the biceps brachii Used to obtain rapid movement

  10. Mechanical Advantage • Force out can be many times larger than force in by using the correct lever system • Fo = Fi (li/lo) • li is the distance from Fi to the pivot (fulcrum), and lo is the distance from Fo to the pivot Fi = 160 dynes 3 mm 1 mm Fo = ? Fo Fi

  11. Velocity • Another advantage can come through velocity • Vo = Vi (lo/li) From: http://www.fiu.edu/~condon/biomech8.gif

  12. Find the force and velocity for the following triceps muscles - the force in is always 2000 dynes • Human • lo = 43 cm • li = 3.5 cm • Mole • lo = 2.4 cm • li - 0.6 cm

  13. Low gear/high gear muscles • Low gear - power (overcome inertia) • High gear - velocity (maintain or increase momentum) • Muscles with the same action, but different, but one is for speed the other is power • Ex. Semimembranosus li = 10.2, lo = 34 • Ex. Gluteus medius li = 3.4, lo = 34 • High gear muscles are shorter (less time to contract)

  14. One last problem • Measure foot from posterior edge of toes to your heel - this is li. • Measure your foot from the same spot to your ankle (malleoli) = lo. • Your weight is Fo, find your Fi.

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