NSCA Science
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Define the A-Band | alignment of MYOSIN (thick)
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| Define the I-Band | light zones containing ONLY ACTIN (thin)
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| Define the Z-Line | middle of the I-band or actin anchor
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| Define the H-Zone | contains ONLY MYOSIN (thick), expands and shrinks with contraction
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| Define the M-Line | middle of the H-zone or myosin anchor
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| Release of _____from an action potential allows the muscle to contract | Calcium
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| Troponin and Tropomyosin are components of which myofibril? | actin (thin)
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| What dictates the amount of force a muscle can produce? | number of cross bridges attached to actin filaments at any instant
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| Function of Troponin | to receive calcium and signal other processes to occur so that cross bridges can form
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| Function of Tropomyosin | runs along the length of actin and is stimulated by troponin and calcium to allow cross bridges to form
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| What two things are necessary for myosin crossbridge cycling? | Calcium and ATP
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| Function of calcium in muscle contraction | opens up cross bridge targets, contraction and relaxation
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| Function of ATP in muscle contraction | cross bridge detachment and recocking
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| All or None Principle of muscle contraction | action potentials are either strong enough to cause ALL muscle fibers to contract or they are not, once a threshold is met there will never be more fibers contracted and there will never be less if there are not enough action potentials
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| Efficient, fatigue-resistant, high aerobic energy supply, low force development, low ATPase activity, low anaerobic power are characteristics of what muscle fiber type? | Type I
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| Inefficient, fatigable, low aerobic power, rapid force production, high ATPase activity, high anaerobic power are characteristics of what muscle fiber type? | Type II
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| Type IIa and Type IIx differ how? | Type IIa has more capillaries meaning more aerobic ability and are more fatigue-resistant, aka Fast-twitch fatigue resistant
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| List two ways muscles can increase the force they produce | 1)Frequency- activating a muscle over and over again within a short time period will allow the force to SUMMATE, 2) Number-the more motor units activated, the more force can be produced
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