Bio 322 Physio Ex 9 Skeletal Muscle Physiology – Flashcards
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Do the skeletal muscle length affect muscle contraction?
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Yes, there is an optimum length that will achieve maximum muscle tension
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What are thin filaments on a sarcomere?
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Actin
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What are thick filaments on a sarcomere?
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Myocin
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What happens when a sarcomere from a muscle is overstretched?
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Miocene heads cannot grab on to the muscle and cannot exert a large contraction
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What happens when a muscle is under stretched?
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If over/under stretched muscle won't have the maximum muscle contraction available
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Does the length of the A band change during sarcomere shortening?
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No, myocin filaments pull actin which don't change the length
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Does the length of the I band change during sarcomere shortening? Why or why not?
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Yes due to the I band being pulled by the miocin filaments?
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If the supply of ATP to a shortening muscle is completely depleted, what will happen to the cross bridge cycle?
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ATP is required to dislodge the myosin heads from the actin filaments in the cross bridge cycle> if no ATP was available, it would cause you to remain in a contracted state
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What is the name of the phenomenon that results from complete ATP depletion?
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Rigor Mortis
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What happens to muscle force if the muscle is stimulated by a voltage above the maximal stimulus? explain
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All the muscle fibers are already recruited by the motor neurons and it would plateau out
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A decrease in the maximal force produced by contracting skeletal muscles despite a continuous high frequency stimulus is called -->
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Fatigue
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What causes fatigue?
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Accumulation of lactic acid, inorganic Phosphorous, and ADP, or an oxygen debt
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What is the difference between a thigh muscle vs an eye muscle? (thigh muscle--> large, eye muscle--> small)
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Thigh muscles have more muscle fibers contracting causing more motor unit recruitment
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What is an isotonic movement?
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Force> than the load, this would be a pushup or a squat
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What is an isometric movement?
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Load > the force, this would be a plank
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When actin/myosin interactions are taking place, are you using ATP?
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Yes
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Do you think isotonic movements can become isometric muscle contractions? If so, when?
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Yes, if you become fatigued. IF the force of contraction becomes less than the weight of the load weight, the movement becomes isometric
