1. 40 pt 60 pt 80 pt 100 pt 20 pt 40 pt 60 pt 80 pt 100 pt 20 pt 40 pt 60 pt 80 pt 100 pt 20 pt 40 pt 60 pt 80 pt 100 pt 20 pt 40 pt 60 pt 80 pt 100 pt 20 pt Muscle Contraction Muscle Contraction (con’t) Hierarchy of Muscle The Sarcomere Everything Else

2. Of the eleven organ systems, the one that initiates skeletal muscle contraction.

3. What is the nervous system?

4. Organelle that stores the Ca ++ necessary for muscle contraction.

5. What is the sarcoplasmic reticulum?

6. Specific part of the myosin molecule that binds to actin.

7. What is the myosin head (resembling a miniature golf club head)?

8. Place where acetylcholine binds to transmit its message?

9. What are Na + channels on the sarcolemma?

10. The portion of the motor neuron that invaginates the muscle fiber and serves to connect the motor neuron and muscle fiber.

11. What is the presynaptic terminal?

12. Organelle that provides the ATP necessary for muscle contraction.

13. What is the mitochondria?

14. This is what the effector cell, the muscle fiber, receives as a result of the continuous electrical charge changes occuring across the sarcolemma

15. What is an action potential?

16. These membrane bubbles carry deliver acetylcholine into the synaptic cleft.

17. What are synaptic vesicles?

18. Name of the muscle fiber enzyme that breaks down acetylcholine when it is bound to the sarcolemma.

19. What is acetylcholinesterase?

20. With regard to membrane potential, this is the ultimate result of acetylcholinesterase breaking down the acetylcholine bound to the Na + channels.

21. What is repolarization (return to resting membrane potential)?

22. The two main protein myofilaments of muscle contraction

23. What are actin and myosin?

24. Bundles of muscle fibers which are surrounded by perimysium.

25. What are fasciculi?

26. The two subproteins found on actin.

27. What are troponin and tropomyosin?

28. Type of connective tissue surrounding fasciculi.

29. What is perimysium?

30. Organelle within the muscle fiber that is responsible for the production of actin and myosin.

31. What is the rough sarcoplasmic reticulum?

32. A sarcomere runs from...

33. What is Z line to Z line?

34. This is how we know this picture shows a contracting muscle.

35. What is the H Zone is getting smaller and disappearing and the sarcomere is shortening?

36. The portion of the sarcomere that contains only the actin filaments.

37. What is the I Band?

38. The portion of the sarcomere that is the most dense.

39. What is the A Band?

40. This is the portion of the sarcomere that disappears completely during muscle contraction.

41. What is the H Zone?

42. Structure represented by #3 on the above diagram

43. What is a fasciculus?

44. In the above diagram, region indicated by #6

45. What is the H Zone?

46. Organelle within the muscle fiber represented by #6

47. What is the sarcoplasmic reticulum?

48. Ion that binds to structure #11 on the above diagram.

49. What is Ca ++ ?

50. This condition occurs when there is no ATP available in the muscle cells, and the muscle cells cannot relax or contract – rather the myosin cross-bridges become perpetually stuck.

51. What is rigor mortis?

52. FINAL JEOPARDY Sustaining Muscle Contraction

53. These three conditions must be met in order for a muscle contraction to be sustained.

54. What are continued action potentials, a supply of Ca ++ and a supply of ATP?