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5. Muscle mechanics - 5 Muscle Mechanics I Types of...

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5. Muscle Mechanics I. Types of contraction a. Isometric- not changing length i. Not length change- instead develops tension during contraction ii. Trying to lift something heavy, but cannot move b. Isotonic- not change in tension i. Shortens w/ constant tension ii. Moving something light c. Combination of isometric and isotonic i. Trying to lift something- isometric contraction ii. Once it lifts- isotonic contraction iii. Putting it somewhere- isotonic relaxation iv. Letting go- isometric relaxation v. The whole event is a contraction but there are contraction/relaxation phases II. Isometric length-tension curve a. Active tension- tension developed during contraction- by actin-myosin interaction b. When muscle is too short actin overlaps and hinders each other to bind to myosin i. Myosin hits z lines- damage c. When muscle is stretched too far then myosin too far from actin, wont bind no contraction d. Working muscle at optimal level- plateaus III. Passive tension- not caused by actin/myosin a.
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