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NSCA Science

Define the A-Band alignment of MYOSIN (thick)
Define the I-Band light zones containing ONLY ACTIN (thin)
Define the Z-Line middle of the I-band or actin anchor
Define the H-Zone contains ONLY MYOSIN (thick), expands and shrinks with contraction
Define the M-Line middle of the H-zone or myosin anchor
Release of _____from an action potential allows the muscle to contract Calcium
Troponin and Tropomyosin are components of which myofibril? actin (thin)
What dictates the amount of force a muscle can produce? number of cross bridges attached to actin filaments at any instant
Function of Troponin to receive calcium and signal other processes to occur so that cross bridges can form
Function of Tropomyosin runs along the length of actin and is stimulated by troponin and calcium to allow cross bridges to form
What two things are necessary for myosin crossbridge cycling? Calcium and ATP
Function of calcium in muscle contraction opens up cross bridge targets, contraction and relaxation
Function of ATP in muscle contraction cross bridge detachment and recocking
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
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
Inefficient, fatigable, low aerobic power, rapid force production, high ATPase activity, high anaerobic power are characteristics of what muscle fiber type? Type II
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
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
Created by: bfranek