How Animals Move. Chapter 32. Skeleton. A medium or structural element against which contractile cells can act Three types Hydrostatic Exoskeleton Endoskeleton. exoskeleton. Endoskeleton. All vertebrates have endoskeletons Fins or limbs attach to skeleton at pectoral and pelvic girdles.
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A myofibril is made up of thick and thin filaments arranged in sarcomeres
Sarcomere shortens because the actin filaments are pulled inward, toward the sarcomere center