The Mechanism of Locomotion in Animals
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Transcript of The Mechanism of Locomotion in Animals
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The mechanism of locomotion in animals
Azneezal Ar-RashidSmk Sri Aman
95007 Sri Aman, Sarawak
February 2010
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Hydrostatic skeleton
• Earthworm– Coelom : fluid-filled
chamber• Surrounded by :
– Circular muscle : » surround the
chamber– Longitudinal muscle :
» one end to another
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• When circular contract, longitudinal relax– Thinner & longer
• When circular relax, longitudinal contract– Shorter & thicker
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• Peristaltic waves– Front to end– Contract rhythmically – Bristles : chaetae
• Anchor parts– Other parts can be pull
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Exoskeleton
• Grasshopper– 6 legs– Antagonistic muscles
• Flexor• Extensor
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Endoskeleton
• Fish – Streamlined body shape– Overlapping scales (backwards)– Covered by a slimy coating– Flexible vertebral column– Myotomes
• W-shaped muscle– Opposite actions
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• Unstable – Yaw : sideways
• Dorsal and ventral fins
– Rolling : transverse• Dorsal and ventral fins
– Pitching : vertical• Pelvic and pectoral fins
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• Swim bladder– What is that? :
• …………………………………………………………
– Function? :• …………………………………………………………