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Chapter 6.2: Skeletal System

Chapter 6.2: Skeletal System. Bone Formation and Growth. Begins 6 weeks after fertilization Continues throughout adolescence Can continue until 25 Ossification—replacing tissue with bone. Intramembranous Ossification. Differentiate into bones Flat bones form this way. Figure 6.4.

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Chapter 6.2: Skeletal System

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  1. Chapter 6.2: Skeletal System

  2. Bone Formation and Growth • Begins 6 weeks after fertilization • Continues throughout adolescence • Can continue until 25 • Ossification—replacing tissue with bone

  3. Intramembranous Ossification • Differentiate into bones • Flat bones form this way

  4. Figure 6.4

  5. Endochondral Ossification • Most bones formed this way • Forms from hyaline cartilage models • Cartilage starts to calcify • Osteoblasts cover shaft • Blood vessels penetrate the cartilage • Bone of shaft thickens

  6. Figure 6.4

  7. Bone Growth • Women—stop by 18 • Men—stop by 20

  8. Requirements for Bone Growth • Calcium • Comes from mom pre-birth • Mom loses bone mass while pregnant

  9. Requirements cont… • Vitamin D3 • Through vitamins or UV rays • Processed by liver • Allows calcium and phosphate to be absorbed

  10. Requirements cont… • Rickets • Soft and bendable bones in kids • Result of vitamin D deficiency • Bowlegged appearance

  11. Requirements cont… • Vitamins A and C • Scurvy—lack of vitamin C • Decreased osteoblast activity • Weak and brittle bones

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