Answers - Muscle Questions - #1

1. State of a muscle at rest.
2. Muscle cell and controlling neuron
3. Muscle cells are recruited in sequence rather than simultaneously.
4. Cytoplasm is flooded with Ca++ ions
5. False - sarcomere
6. Z-line
7. False - Muscle cell movement creates heat by friction.
8. Long - longus
Lateral - lateralis
diagonal - oblique
triangular - deltoid
saw-toothed - serrated
diamond - pyramidis
circular - orbicularis
wide - lattisimus

9. Insertion
10. rhomboidus thoracicus
11. origin
12. False
13. False - heredity
14. True
15. False - isometric
16. False - remember the "all-or-nothing" principle
17. 300
18. True
19. muscle cell and nerve cell
20. True (poplitius locks and unlocks the knee)

Remember the organizational order (smallest to largest) for muscles:
sarcomere --> myofibril--->muscle fiber--> muscle fascicle-->skeletal muscle