Crossword
Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.
Check
Across:
1. 7 down ions are released from here in response to the action potential travelling down 12 across 3. These are able to attach to actin once 4 across has moved away 4. This blocks binding sites on the actin when muscle is not contracting 5. Released from vesicles at the synaptic knob 8. Enzyme which hydrolyses 9 across 9. This binds to a myosin head to cause it to become detached from the actin filament 10. This unit becomes shorter as the muscle contracts 11. The ---------- of 9 across provides energy to return the myosin head to its original position 12. These are extensions of the muscle cell surface membrane and branch throughout the sarcoplasm
Down:
2. Can regenerate ATP from ADP and Pi 6. Formed when a myosin head binds to the actin filament 7. These ions diffuse into the synaptic knob when an action potential reaches a neuromuscular junction