Which of the following is most abundant form of collagen present in dermis?
**Core Concept**
Collagen is a crucial protein that provides structural support and elasticity to the skin. It is the most abundant protein in the human body, and different types of collagen are found in various tissues, including skin, bones, and tendons. The dermis, a layer of skin, contains a specific type of collagen that provides its tensile strength.
**Why the Correct Answer is Right**
Type I collagen is the most abundant form of collagen present in the dermis. It is composed of two alpha-1 chains and one alpha-2 chain, which are covalently bonded together through hydrogen bonds and hydroxyproline links. Type I collagen provides the tensile strength and elasticity to the dermis, allowing it to withstand stretching and flexibility. The triple-helix structure of type I collagen is stabilized by hydrogen bonds between the alpha chains, which contributes to its mechanical properties.
**Why Each Wrong Option is Incorrect**
**Option A:** Type II collagen is primarily found in cartilage, not in the dermis. It is essential for maintaining the structure and function of cartilage in joints and other areas.
**Option B:** Type III collagen is often found in association with type I collagen and is more abundant in blood vessels and muscles. However, it is not the most abundant form of collagen in the dermis.
**Option C:** Type IV collagen forms a network of filaments that provide structural support to the basement membrane, a thin layer of tissue that separates the dermis from the epidermis. While it is present in the skin, it is not the most abundant form of collagen in the dermis.
**Clinical Pearl / High-Yield Fact**
Type I collagen is not only the most abundant form of collagen in the dermis but also a key component of wound healing. It provides a scaffold for fibroblast migration and collagen synthesis, facilitating the repair of damaged skin tissue.
**Correct Answer: C. Type I collagen**