Choose the correct answer.

1. Bones are made of
   1. minerals and salts
   2. acids and bases
   3. living cells and minerals
   4. salt and water
2. The jelly-like material inside the long bones is known as
   1. plasma
   2. bone marrow
   3. bone meal
   4. bone sap
3. Ribcage protects the
   1. lungs and heart
   2. brain
   3. spinal cord
   4. stomach and liver
4. The longest bone of the body is
   1. ulna
   2. radius
   3. femur
   4. stirr up
5. Our blood cells are prepared in the
   1. bone marrow
   2. heart
   3. intestine
   4. liver
6. The joints of skull are
   1. fixed
   2. movable
   3. gliding
   4. hinge
7. The tissue that prevents the bones rubbing against each other is
   1. cartilage
   2. ligament
   3. tendon
   4. none of these
8. The joint found in the neck is 
   1. gliding
   2. hinge
   3. pivotal
   4. ball-and-socket
9. Walls of stomach, intestine and alimentary canal have
   1. smooth muscles
   2. skeletal muscles
   3. cardiac muscles
   4. all of these
10. Muscles work in pairs by
    1. contraction only
    2. contraction and expansion
    3. expansion only
    4. neither contraction nor expansion