Lesson 1 - SUPPORT SYSTEMS IN ANIMALS - Brebner High School

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Types of skeleton• Some animals may be supported by awatery fluid inside their bodies(earthworm) – hydrostatic skeleton• Some have a hard external skeleton(crabs/locusts) – exoskeleton• Some have bone internal skeletons (frogs,birds) – endoskeleton

GRADE 11 BUSINESS STUDIES - Brebner High School

HYDROSTATIC SKELETONCONSISTS OF:• Fluid under pressure in a closed body compartmentMOVEMENT: These animals move by the contraction and relaxationof muscles acting against the fluid in the body compartments.<strong>ANIMALS</strong>:• Jelly-fish• Flatworms• Roundworms• Earth worms

Page 2: TYPES OF SKELETONS• Hydrostatic s
Page 8 and 9: HYDROSTATIC SKELETONENVIRONMENT:•
Page 10 and 11: EXOSKELETONMOVEMENT:• Muscles are
Page 12: ENDOSKELETONCONSISTS OF:• Hard su
Page 15 and 16: ENDOSKELETONDISADVANTAGES• Parts

Lesson 1 - SUPPORT SYSTEMS IN ANIMALS - Brebner High School

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