Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
NSCA Science
| Question | Answer |
|---|---|
| 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
Popular Sports Medicine sets