Question

1)which type of cartilage resists extension and deformation without breaking?
2)Bone grows is diameter by ________growth?
3)the layer of connective tissue on the outside of a skeletal muscle is called?
4)the functional unit of the cardiovascular system is?
5) the outermost layer of arteries and veins is called?
please help me answer these questions. thanks

Answer 1

1) Articular cartilage

Justification: Articular cartilage contains type II collagen fibers and peoteoglycans which helps in resisting the extension and deformation. This cartilage is said to have viscoelastic properties to overcome the breakage during deformation. They helps in restricting the mechanical deformation. The collagen fibers and proteoglycans exerts a negative charge by repelling each other. This repelling force helps in stiffening the ground substance and thereby resisting the deformation and extension of cartilage.

2) Appositional growth (Increase in diameter of bones by addition of bony tissue at surface of bones).

Justification: Increase in the growth of diameter of bone occurs by the apposition by the addition of bony tissue at the bone.

3) Epimysium

Justification: Each skeletal muscle is surrounded by layer of connective tissue called 'epimysium'. The connective tissue outside the epimysium is called fascia and it helps in surrounding and separating the muscles.

4) Capillaries

Justification: The functional unit of cardiovascular system or the circulatory system is capillaries, which are the smallest blood vessels with a diameter of 7-10 micrometers. The exchange of nutrients and gases takes place here and it occurs between blood and tissues.

5) Tunica externa or Tunica adventitia

Justification: The arteries and veins consists of three layers. The outermost layer is called 'tunica externa' or 'tunica adventitia' and it is a thick layer which is made up of a connective tissue. The middle layer is called 'tunica media' and inner layer is called 'tunica intima'.

Thank you!