U3 S14

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U3 S14
2012-01-08 23:16:08

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  1. The Skeletal System
    Blood Cell Production
    At the center of bones is soft tissue called marrow. Red marrow, which makes blood cells, is found mostly in flat bones such as the ribs, pelvis, and skull.
  2. The Skeletal System
    Bones play an important role in movement by providing a place for muscles to attach. Muscles pull on bones to move the body. Without bones, muscles could not do their job of moving the body.
  3. What are the parts of the skeletal system?
    Bones, ligaments, and cartilage.
  4. What is the axial skeleton?
    The skull, vertebrae, and ribs. It supports the body's weight and protects internal organs.
  5. What is the appendicular skeleton?
    The arms, legs, shoulders, and pelvis. It allows for most of the body's movement.
  6. What are bones and what do they do?
    Bones are hard organs made of minerals and connective tissue. They have blood vessels that supply nutrients and nerves which signal pain.
  7. What are ligaments and what do they do?
    Ligaments are tough, flexible strands of connective tissue that hold bones together. They allow movement and are found at the end of bones. Some prevent too much movement of bones.
  8. What is cartilage and what does it do?
    Cartilage is a strong, flexible, and smooth connective tissue found at the end of bones. It allows bones to move smoothly across each other.
  9. What are the two kinds of bone tissue?
    • Compact bone is dense and has no visible open spaces. It makes bone rigid and hard. Tiny canals within compact bone contain blood capillaries.
    • Spongy bone has many open spaces. It provides most of the strength and support for a bone. In long bones such as the arm or the leg, an outer layer of compact bone surrounds spongy bone and marrow.
  10. What is the most plentiful mineral in bones?
    Calcium. Minerals such as calcium make bones strong and hard. They are deposited by cells called osteoblasts.