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6. Sarcomeres are contractile units
7. ADP and Pi are released when...
- tropomyosin shifts exposing myosin binding sites on the actin
- the myosin head binds to the myosin binding sites on the actin forming cross bridges
- calcium ions diffuse from the sarcoplasmic reticulum through the sarcoplasm towards the actin
8. ADP and Pi are released when ATPase on the myosin head hydrolyses the attatched ATP
9. The myosin head detatches from the actin when ATP binds to it
10. A sarcolemma is...
- a contractile unit
- the cell surface membrane of a muscle cell
- the cytoplasm of a muscle cell
11. When filaments in a contracted sarcomere are looked at under a microscope...
- the central lighter coloured band is no longer visible
- the central intermediate coloured band is no longer visible
- the central dark coloured band is no longer visible
12. Muscle cells do not contain many mitochondria
14. In rigor motis there is no ATP to detach the myosin head