6 Steps Of Muscle Contraction

Question: step 1

Answer: Calcium ions rush into muscle fibers

Question: step 2

Answer: Calcium binds to troponin

Question: step 3

Answer: Troponin changes shape and exposes actin binding site

Question: step 4

Answer: Myosin heads bind to actin binding site making a cross bridge

Question: step 5

Answer: Myosin heads do a powerstroke (using ADP and P) which slides actin and decreases length of sarcomere (Z line to Z line)

Question: step 6

Answer: ATP causes release of myosin head from actin binding site (cross the myosin head is free to repeat the cycle as long as calcium is in and the ATP available)

Donation Page

Support Our Work

Do you appreciate the value this website provides? If so, please consider donating to help keep it running. Your donation will go a long way in helping us continue to provide the same quality of content and services. Every bit helps, and your support is greatly appreciated. Thank you for your generosity.