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Augustine DiGiovanna, Ph.D.


Fig. 8.1 Skeletal muscles in the muscle system.


Fig. 8.2 Components of a skeletal muscle.


Fig. 8.3 Components of a muscle cell.


Fig. 8.4 Obtaining energy in muscle cells.


Fig. 8.5 Myofilaments and the process of contraction: (a) Contraction begins. (b) Contraction ends. Sarcomeres and cells are shorter.




“Muscle Contraction and Locomotion”

NOTE: Error !!! At the end of contraction, the myofilaments do NOT slide back to their original positions. They must be puller back to their original position by an external force, such as another muscle, body elasticity, or gravity.


Fig. 8.6 Motor units.


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