Rigid Skeleton - Skeletal System, Lecture notes of Biology

Download Rigid Skeleton - Skeletal System and more Lecture notes Biology in PDF only on Docsity!

RIGID SKELETON

AND ITS

PRINCIPLES

Group 4 Reporter : Angelique Nicole B. Tubang

HYDROSTATIC VS RIGID

Earthworm’s Skeleton Dog’s Skeleton

• (^) Fluid (^) • (^) Solid

PURPOSE OF THE RIGID SKELETON

• (^) Contraction
• (^) Movement

TENDONS IN THE RIGID SKELETON  (^) Tendons or cords are made of tough tissue, and they work as special connector pieces between bone and muscle.  (^) Muscles contracts in the Rigid Skeletal System.

PRINCIPLES OF

RIGID

SKELETON

• (^) Endoskeleton
• (^) Exoskeleton

EXOSKELETON  Exoskeleton is often a limiting coat of armor that must be periodically molted to make way for an enlarged replacement.  (^) Ecdysis – shedding of skin (insects and anthropods)

ARTHROPOD S Arachnids Myriapods

ARTHROPODS Crustaceans Insects

• (^) Appendages for locomotion

EXOSKELETON  (^) It can be in the form of a shell , a spicule or a calcareous , proteinaceous or chitinous plate. Sea Sponge

PRINCIPLES OF

RIGID

SKELETON

• (^) Endoskeleton
• (^) Exoskeleton

• (^) spines and skin
• (^) Ossicles – flexible joints of Star Fish and Brittle Star fish

• (^) Bones and cartilages
  • (^) “major reservoir for calcium and phosphorus”