Bio 322 Physio Ex 9 Skeletal Muscle Physiology – Flashcards

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