Explain the difference between subthreshold, threshold, submaximal and maximal stimulus.
Stimuli
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15
What happens between the power stroke and the return stroke?
ATP binds to the myosin heads causing them to release the active sights on the actin. (setting the stage for a sequel)
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15
Two muscle fibers that are right next to each other do not contract at the same time. are they part of the same motor unit?
no
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15
What does acetylcholinesterase do for the muscle?
Breaks down the neurotransmitter acetylcholine, preventing action potentials from reaching muscle. allowing the muscle to relax
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15
Explain step E
Return stroke:ATP breaks down to ADP and P which stays bound to myosin heads.Energy released, myosin heads powered up like a set mouse trap
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15
What are the z disks?
a border formed by alternating filaments in a zig zag pattern. it is the anchoring site for the actin myofilaments
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15
What causes an oxygen debt?
This occurs when muscles are don't receive enough O2 for anerobic respiration to supply the energy needs. it relies on creatine phosphate and anerobic respirati
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What causes the sliding part of the sliding filament model?
When the myosin head binds to the actin site and pulls, causing the actin and myosin monofilaments to slide with respect to each other.
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What causes rigor mortis?
moving Ca into the sarcoplasmic reticulum requires energy (low to high concentration) so,Ca leaks into the muscles......
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What kind of energy source do muscles take advantage of that requires oxygen and what kinds do not?
aerobic respiration is very efficient and requires oxygen, using creatine phosphate does not use oxygen, and anaerobic respiration does not require oxygen.
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15
Why do muscles need energy to relax?
ATP is needed to actively pump calcium ions back into the sarcoplasmic reticulum
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25
What shortens in the sarcomere and what stays the same length?
a-actin, b-myosin, and d- A band stay the same c-h zone and e- I band shorten
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15
What does it mean when a motor neuron is recruited?
motor neuron is recruited: it is responding to a stimulus by sending action potentials down its axon.