Cross-Bridge Cycle of Muscle Contraction

Muscle contraction requires myosin to bind to actin. Calcium moves allows troponin and tropomyosin to reconfigure their shapes so that myosin can bind to actin. As myosin ejects its ADP, the "powerstroke" occurs. Myosin then binds to a new ATP and hydrolyzes it to ADP. This hydrolysis changes the shape of myosin so that it is now ready and able to bind once again to actin. This process continues as long as calcium and ATP are plentiful.
Find diagrams, notes, and practice questions at www.sciencewithsusanna.com

[@siddhantpradhan1419]

Beautifully explained
Lots of love and respect Maam

[@maiwandali6014]

i finally understood this in scale with actual contraction of muscles such as biceps
thank you very much

[@zahraanaama4028]

Great illustration, but what just learned in class that Ca binds to troponin, and removes the blocking action of tropomyosin and cross bridge forms(myosin and actin can now bind) bc isn't tropomyosin that is in the way?

[@fatimaghulam8677]

yes!

[@sonunayak-bi6nz]

u make my day mam

[@MrMiddenfacemcnulty]

Great video. Thanks.

[@user-tt1eg2sr6f]

Good video. Thanks 🙏

[@luket2169]

great explanation!!

[@sheetsngiggles7640]

loved the explanation thank you so much!!!

[@faizmalik7174]

love u , cleared my major doubt.

[@megshek]

Thanks

[@markmcdonald1371]

Great video :)

[@amandaswan7]

Thank you

[@Dd-yd2kq]

Greaaaaat

[@vedranarudan8952]

simplified, but nothing left out

[@alarabi4862]

its not troponin its tropomyosin

[@jeffinjoy784]

Hello, sussannaa miss can u please say a hi to me

[@preethikaraju5437]

Hi