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Prep4USMLE » USMLE Step 1 Forum » Physiology Forum » Comments on actin-myosin


 actin-myosin  



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KEROCHI

Forum Guru

Topics: 60
Posts: 970
Apr 17, 2005 - 5:15 PM       #1

When skeletal muscle is in its resting state, myosin cross bridges are prevented from binding to actin molecules by w/c of the ff:

A. calmodulin
B. troponin
C. tropomyosin
D. titin
E. phospholamban


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willway

Forum Junior

Topics: 16
Posts: 23
Apr 17, 2005 - 7:36 PM       #2

c??????


Moctopod

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Apr 18, 2005 - 4:58 AM       #3

b. Troponin


KEROCHI

Forum Guru

Topics: 60
Posts: 970
Apr 18, 2005 - 5:38 AM       #4

The answer is C

When skeletal muscle fibers are at rest tropomyosin inhibits the interaction bet. actin & myosin. The inhibition is removed when Ca binds to troponin.





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