Question

Which of the following proteins is the most abundant in the human body?
(a) Collagen
(b) Myosin
(c) Actin
(d) Albumin

Answer 1

Hint: They enrich the body tissues with toughness, structure, texture, and rigidity. It is like the bed of leather within the skin. When it blends with elastic fibers, the skin is provided with resilience and strength.

Complete answer:
Collagen is the protein that is most abundantly present in the human body. More than one hundred structural proteins have been identified in the body, but the plentiful of them are collagen, which covers about six percent of total body weight. Collagen comprises thirty percent of bone tissue and includes large amounts of tendons, ligaments, cartilage, skin, and muscle. Collagen is a strong, fibrous protein made from mostly glycine and proline amino acids. Within its quaternary structure, three protein strands twist one another sort of a rope then these collagen ropes overlap with others. This highly ordered structure is even stronger than steel fibers of equivalent size. Collagen makes bones strong, but flexible. Collagen fibers within the skin’s dermis provide it with structure, and the conduct elastin protein fibrils build it flexible. Pinch the skin on your hand then let go; the collagen and elastin proteins within the skin allow it to travel back to its original shape. Smooth-muscle cells that secrete collagen and elastin proteins encircle blood vessels, giving the vessels with structure and the capability to stretch back after blood is pumped through them.

Additional information:
The closely packed collagen fibrils in tendons and ligaments leave synchronous mechanical movements of bones and muscle and therefore provide the capability of those tissues to jump back after a movement is complete. Move fingers and observe the synchrony of knuckle movements. In order to move, muscles must contract. The contractile parts of muscles are the proteins actin and myosin. When these proteins are stimulated by an impulse they slide across one another, causing a shortening of the muscle fiber. Upon stimulation, multiple muscle cells shorten at an equivalent time, leading to contraction.

So, the correct answer is ‘Collagen’.

Note:
Collagen accounts for close to one-third of its composition of proteins. Some other areas where collagen is present comprise teeth, cornea, and blood vessels. Its role isn't limited to providing a framework or a structure but it also participates within the clotting of blood. As you age, your body produces inferiority and lesser collagen.