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Excitation Coupling & Sliding Filament Model- 1st & 2nd step in muscle contraction

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porschefan1's version from 2017-10-30 23:21

Section 1

Question Answer
Nerve Impulse (Action Potential (AP))Step 1
Neuromuscular junctionStep 2
Acetylcholine (ACh)Step 3
SarcolemmaStep 4
DepolarizationStep 5
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Section 2

Question Answer
AP...T tubulesStep 6-after excitation coupling but before sliding filament
Release calcium from Sarcoplasmic reticulumStep 7
Rotate tropoStep 8
expose actin binding siteStep 9
Myosin head attaches + strokeStep 10
Myosin head detach & cock- needs ATP (calcium goes back to SRStep 11
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Section 3

Question Answer
step 11 ATP stores for?4 seconds
Creatine phosphate CP (2 atp)10 sec
Glycolysis (lactic acid)1 min
Aerobic pathway 32 ATP'shours
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Section 4

Question Answer
Actinthin/iband/tropomyosin/moves/has bonding sites
Myosinmiddle of sarcomere/thick/a band/stationary/heads
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Section 5

Question Answer
Muscle structure Largest (1) to smallest (5)muscle
2fasicles
3fibers (cells)
4fibrils (80% of mass)
5filaments (these slide)
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Section 6

Question Answer
1. largest structural component of musclefascicle
2.muscle fiber
3.myofibril
4. sarcomere
5. smallestmyofilament
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Section 7

Question Answer
1.outer muscle wrappingepimysium
2.perimysium
3. innermost muscle wrappingendomysium (aka sarcolemma/sarcoplasm)
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Section 8