Chapter 9 part 1

Chapter 9 part 1 - How and why do our limbs move? 10/22 How...

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How and why do our limbs move? 10/22 How do muscles work through levers to generate force and cause limbs to pass through a range of motion? What does mechanical advantage tell us? What terms are used to describe muscles? What muscles return limbs to their original position? What types of muscle do we have?
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Biomechanics describes what a limb can  move and why it can (cannot) move it.  Muscle Contractions: shorten their length to exert force on a tendon (EFFORT) Resistance: What the muscle attempts to move against (Gravity or elasticity or other LOAD) Fulcrum: fixed point that motion occurs across Effort Arm: distance from fulcrum to muscle insertion Resistance Arm: distance from fulcrum to resistance site
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By shortening the length of a muscle, contractions create force. Tendons then transmit force to bones at the insertion. Ligaments limit the range of motion. What three types of lever do muscles use:
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Chapter 9 part 1 - How and why do our limbs move? 10/22 How...

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