Muscular System

5. Unstriated and involuntary
10. A molecule that resembles troponin in smooth muscle cell
12. Cross-bridge detaches at end of power stroke and returns to original conformation
13. Thin filaments
18. Electrical charge within a cell becomes less negative
19. Enzyme that hydrolyzes ATP to ADP
21. Anaerobic metabolism of glucose
23. Receptor located in the membrane of the transverse tubule
24. Thick filaments
25. An important feature of skeletal muscle cell that smooth muscle doesn't have

1. A type of oxidative skeletal muscle fiber where there's fast contraction and reliance on oxidative phosphorylation for ATP
2. Smooth, sustained contraction of maximal strength
3. Receptor located in the membrane of the sarcoplasmic reticulum
4. Striated and voluntary
5. Smallest unit of a muscle cell, able to contract
6. Electrical charge within a cell becomes less positive
7. A type of skeletal muscle fiber where there's very fast contraction and reliance on glycolysis for ATP
8. A type of oxidative skeletal muscle fiber where there's slow contraction and reliance on oxidative phosphorylation for ATP
9. Myosin cross-bridge binds to actin molecules
11. Fluid where the majority of calcium enters in smooth muscle contraction
14. Chemical that binds to troponin to trigger start of muscle contraction
15. Protein structures that make up muscle fiber
16. Smooth muscle cells that are activated by neuronal input
17. Inability of muscle to maintain tension
20. A type of recruitment of motor units to delay or prevent fatigue
22. Striated and involuntary
26. Neurotransmitter that kick starts a muscle contraction