Strength to the bones is given by the hard and non-pliable ground substance composed of:

(1) Calcium salts and collagen fibres

(2) Calcium salts only

(3) Calcium and magnesium salts

(4) Elastin fibres

(1) Bones have a hard and non-pliable ground substance rich in calcium salts and collagen fibres which give bone its strength.

Difficulty Level:

  • 67%
  • 11%
  • 21%
  • 3%