NEET PG Medical – 2019 – Question – 46
Collagen present in skin is
a) Type II
b) Type I
c) Type III
d) Type IV
Show Answer
Correct Answer – B
Answer: B. Type I
- Collagen is a protein that is part of cartilage, bone, and other tissues in animals and humans.
- As the main component of connective tissue, it is the most abundant protein in mammals.
- Collagen consists of amino acids wound together to form triplehelices l of elongated fibrils. It is, mostly, found in fibrous tissues such as tendons, ligaments, and skin.
- So far, 28 types of collagen have been identified and described.
The five most common types are:
- Type I: skin, tendon, vasculature, organs, bone (main component of the organic part of bone)
- Type II: cartilage (main collagenous component of cartilage)
- Type III: reticulate (main component of reticular fibers), commonly found alongside type I.
- Type IV: forms basal lamina, the epithelium-secreted layer of the basement membrane.
- Type V: cell surfaces, hair, and placenta
