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Chapter 14 Notes
 

Chapter 14 Notes

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    Chapter 14 Notes Chapter 14 Notes Presentation Transcript

    • Chapter 14 Support and Movement
    • 14:1 The Role of the Skeleton
      Functions of the Skeleton
      Skeletal system is the framework of bones in your body.
      Skeleton helps support the entire body.
      Helps to protect certain organs.
      Brain, Heart, and Lungs are soft tissue that can be easily damaged.
      Skull protects brain, Ribs protect heart and lungs.
    • 14:1 The Role of the Skeleton
      Functions of the Skeleton.
      Many bones in your body make blood cells.
      Blood cells are made within the bone marrow.
      Bone marrow is the soft center part of long bones.
      Ham steak is the muscle around a pig’s thigh, and the bone in the center is the pig’s thigh bone.
      At the center of the bone is the bone marrow.
    • 14:1 The Role of the Skeleton
      Functions of the Skeleton
      Bones also store calcium.
      Calcium is a mineral used by the body and is part of the bones.
      Calcium gives bones there strength.
      Without calcium bones would become weak or brittle.
    • 14:1 The Role of the Skeleton
      Functions of the Skeleton
      The last job of your skeleton is to provide a place for muscles to attach.
      a. If muscles were not attached to the bone you would not be able to move.
    • 14:1 The Role of the Skeleton
      Bones in the Skeleton
      There are 206 bones in the human skeleton.
      22 bones make up the human skull.
      Common name of the bone is usually different from the medical name.
      a. You will need to know both names!
      Three smallest bones in the body are in the ear.
      They measure only two centimeters long.
      Hammer, anvil, stirrup.
    • End of Notes Day #1
      Define Key Science Words page 302
      Homework Quiz on Key Science Words Friday January 8th, 2010
      Both skeletons must be labeled for Thursday.
    • 14:1 The Role of the Skeleton
      Bone Growth
      Bone tissue is alive and made of cells, just as in other organs.
      Bone cells can reproduce (mitosis) and make more bone cells.
      This results in bone growth.
      As you age the size and number of bones in your body increase. (see pg 288 14-2)
      a. An infant has 5 bones in their wrist, an adult has 8 bones in their wrist.
    • 14:1 The Role of the Skeleton
      Bone Structure: Bones are made of six types of tissue
      Cartilage: Tough, flexible tissue that supports and shapes.
      Acts as cushion where bones meet.
      Does not store calcium, so it is softer.
      Ears and tip of nose are cartilage.
    • 14:1 The Role of the Skeleton
      Outer Membrane
      Thin sheet of tissue.
      Has many nerves and blood vessels.
      This is the part that hurts when bumped or bruised.
    • 14:1 The Role of the Skeleton
      Solid Bone
      Very compact part of the bone .
      Usually found on the outer edges.
      Very strong.
      Calcium stored here.
    • 14:1 The Role of the Skeleton
      Spongy Bone
      Many empty spaces. (like a sponge)
      Found near the ends of bones.
      Strong like solid bone and gives the bone strength.
      Stores calcium.
      Bird skeletons: much of their bone tissue is spongy bone.
    • 14:1 The Role of the Skeleton
      Bone Marrow
      Produce red and white blood cells.
      Soft center part of the bone.
      Ligaments
      Tough fibers that connect bone to bone.
      Found at joints in your body. (not that type of joint!)