Question

Tendon is made up of
A. Mainly collagen fibres
B. Inelastic connective tissue fibres
C. Elastic connective tissue fibres
D. Inelastic and elastic connective tissue fibres

Answer 1

Hint: Tendons are tissues that connect bones to the muscles. tendons are also known to connect muscles with each other. They are compact tissues with limited blood supply. Tendons are classified as fibrous connective tissues.

Complete answer:
Option (a) is correct. Tendons are made up of collagen fibres. Collagen fibrils aggregate to form collagen fibres, which in turn form bundles of sub fascicles. Numerous sub fascicles aggregate together forming muscle fascicles. Many muscle fascicles are grouped together to form the tendon structure. Collagens commonly present in tendons are Collagen I, III and IV. The collagens present in tendons are held together by glycosylated proteins called proteoglycans.
Option (b) is incorrect. Inelastic connective tissue fibres are those that do not show elasticity. They are resistant to stretching and present in tissues that aid movement of body parts.
Option (c) is incorrect. Elastic fibres are secreted by fibroblasts. They contain a specialized protein called elastin. This protein helps the elastic fibres to come back to their original position after they are stretched, hence the name Elastic fibres. The connective tissues that have numerous elastic fibres contained in them are called elastic connective tissue. They are found mostly in lungs, arteries and heart – where the tissues show contraction and relaxation.
Option (d) is incorrect. As discussed above the elastic and inelastic connective tissue fibres are not present in the tendons.

Hence, the correct answer is option (A).

Note: Tendons are compact connective tissues that connect muscles to bones and also to other muscles. They are made up of collagen fibrils that are organized into fascicles. Tendons help in movement of body parts and are also known to stabilize the joints.