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Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYStructural Organisation in Animals3 Marks
Question
Classify bones on the basis of texture.
✓

Answer

On the basis of texture, bones may be compact or spongy.
  1. Compact bone: It has lamellae arranged in regular Haversian systems without gap between them. It is comparatively hard and compact. Compact bones are found in the shaft of long bone. Its cavity contains yellow bone marrow.
  2. Spongy bone: It has lamellae, called trabeculae that forms interlacing network with small spaces between them. These spaces contain red bone marrow. The spongy bones are without Haversian systems. This bone form expanded ends of long bones, vertebrae, ribs, skull bones.

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