Biology handbook for neet. (Dr Anand Mani)

Structural Organisation in Animals

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SPËÇÏÅLÏZËD ÇØÑÑËÇTÏVË TÏSSÜËS

Cartilage, bones and blood are various types of specialized connective

tissue.

ÇÅRTÏLÅGË:

In this, intercellular material (matrix) is

solid and pliable (due to chondroitin

salts) and resists compression.

Cartilage

cells

(chondrocytes)

are

enclosed in small cavities within the

matrix secreted by them. (NEET 2014)

Most of the cartilages in vertebrate

embryos are replaced by bones in adults.

Cartilage is present in the tip of nose, outer ear, joints in the vertebral

column, limbs and hands in adults.

BØÑË:

It has hard and non pliable matrix rich in

calcium salts and collagen fibres which give

bone its strength.

Bone cells (osteocytes) are seen in spaces

called lacunae.

Functions

It provides structural frame to the body.

Support and protect softer tissues and organs.

Limb bones serve weight-bearing functions.

They also interact with skeletal muscles attached to them to

bring about movements.

Take part in locomotion and movements.

Blood cells are produced in bone marrow.

Red blood

Dense regular

Dense Irregular

Bone

Collagen fibre

Collagen fibres

Cartilage cell

(chondrocyte)

Haversian

canal

Cartilage

White

Red blood cells

Bloo