Answer:
Ground substance:
Ground substance may be defined as the component of extracellular matrix that made up of proteoglycans. The main function of ground substance is to resist the compressive forces.
Collagen fiber:
Collagen fiber may be defined as a type of protein fiber that provides strength to the organism. Collagen fibers are present within the matrix of the cell.
Elastic fiber:
Elastic fiber are presnt in bundles in the extracellular matrix. The amorphous elastin is present in the elastic fiber. This fiber provide elasticity to the cells.
Reticular fiber:
Reticular fiber composed of the type III collagen. The reticular fiber acts as the supportive mesh of the liver and bone marrow. Reticular fiber was discovered by M. Siegfried.
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Answer: There are 270 bones at birth and 206 during adulthood!
Explanation: Some of the bones squeeze together!
