1. Muscular & Skeletal Systems

4. Figure 30.8_1 Muscle Several muscle fibers Single muscle fiber (cell)

5. Figure 30.8_2 Plasma membrane Nuclei Myofibril Light band Dark band Light band Z line Sarcomere Single muscle fiber (cell)

6. Figure 30.8_3 Sarcomere Z line Thick filaments (myosin) Thin filaments (actin) Light band Dark band Light band Z line Sarcomere

7. Figure 30.9A Relaxed muscle Contracting muscle Fully contracted muscle Dark band Sarcomere Contracted sarcomere ZZ

8. Contraction of I and A bands http://www.lab.anhb.uwa.edu.au/mb140/corepages/muscle/Images/Mus1ani.gif

9. Figure 30.10B Myosin-binding sites blocked Myosin-binding sites exposed Myosin-binding site Ca 2  floods the cytoplasmic fluid Actin Tropomyosin Ca 2  -binding sites Troponin complex

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12. Figure 30.10A Motor neuron axon Synaptic terminal T tubule Action potential Mitochondrion Endoplasmic reticulum (ER) Myofibril Plasma membrane Sarcomere Ca 2  released from ER

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34. Figure 30.4 Cartilage Spongy bone (contains red bone marrow) Compact bone Central cavity Yellow bone marrow Fibrous connective tissue Blood vessels Cartilage

35. Figure 30.5B