The Cross Bridge Cycle
Trending Questions
Q.
What is the correct sequence of events in the cross bridge formation?
i. The power stroke
ii. Cross bridge formation
iii. Myosin head is activated by ATP
iv. Calcium released binds to the troponin unblocks the actin sites
v. Cross bridge detachment
vi. Reactivation of the myosin head
iii, iv, i, v, ii, vi.
ii, i, iv, iii, v, vi.
iv, iii, ii, i, v, vi.
i, v, ii, iii, iv, vi.
Q. During the power stroke phase of the cross-bridge cycle
- The myosin head pivots toward the middle of the sarcomere and pulls the attached actin filament with it.
- The actin head pivots toward the middle of the sarcomere and pulls the attached myosin filament with it.
- Ca++ ions are removed from the sarcoplasm
- Crossbridges rotate so that the myosin filaments fold in half
Q. Thin filament is made up of
- Myosin and troponin
- Actin, troponin and tropomyosin
- Actin and tropomyosin
- Actin and troponin