Chapter 8 Body Movements

  • We can walk, fly, jump, run and can do every possible activity with the help of our body movements.
  • Body movements are of different types, it may be rotatory, circulatory, oscillatory etc.
  • With the help of bones and muscles our body can move.
  • Where two bones are connected at a point, is called joint.
  • Our shoulder can move in any direction because of the presence of ball and socket points which allows movement of shoulder in all directions.
  • Pivot joint is present in our neck due to which our neck can move from left to right or can move in forward and backward direction.
  • Hinge joint is allows movement of body parts only in one direction. It is present in elbow and knee.
  • Fixed joints are present in skull which cannot move like upper jaw bone; lower jaw bone is exception because it is movable.
  • A framework of bone called skeleton which gives shape to our body.
  • Wrist is flexible because it is made up number of small bones of carpel.
  • Chest bone and backbone together form a rib cage which protects the delicate organ like heart in the chest.
  • Cartilage is hard but not much hard as compare to the bones. Cartilage is present in our ear and nose.
  • Muscles helps in the movement of bones by contraction or relaxation.
  • Earthworm secretes a slimy substance which helps in the movement.
  • Snail shows very slow movement because movement is done by the muscular feet.

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Exercise 1 ( Page No. : 78 )

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