Invert Skeletal Systems

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Presentation transcript:

Invert Skeletal Systems

Types of Skeletal Systems Changes in movement occur because muscles pull/push against a support structure, called the skeletal system >Endoskeletons >Exoskeletons >Hydrostatic skeletons

Endoskeleton

Invert w/Endoskeletons (?) -Echinoderms have calcite skeletons, that have calcium carbonate

Exoskeleton [Will cover in detail much later]

Exoskeleton (nice ride!)

Hydrostatic Skeletons

Hydrostatic Skeletons

Hydrostatic Skeletons

Figure 5.2

Figure 5.3

Chaetae get lifted in regions of circular muscle contraction. Hydrostatic Skeletons Chaetae get lifted in regions of circular muscle contraction. During longitudinal muscles contraction, chaetae anchor into the ground

Hydrostatic Skeletons

Longitudinal muscle contractions allow for: Bending Undulating Shortening / retraction of posterior end Peristalsis Coordinated / alternating contractions of circular and longitudinal muscles Useful for forward propulsion and burrowing

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