True about aicular cailage
**Core Concept**
Articular cartilage is a type of connective tissue that covers the ends of bones in synovial joints, allowing for smooth movement and reducing friction between the joint surfaces. It is composed of a dense matrix of collagen and proteoglycans, with a small amount of water content.
**Why the Correct Answer is Right**
The correct answer is related to the composition and function of articular cartilage. Articular cartilage is avascular, meaning it lacks blood vessels, which is essential for its low friction and wear properties. The absence of blood vessels also means that articular cartilage has limited ability to repair itself, making it prone to degenerative conditions such as osteoarthritis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as articular cartilage is not innervated by pain receptors, which is a key feature of its function.
**Option B:** This option is incorrect as articular cartilage is not a type of bone tissue, but rather a distinct type of connective tissue.
**Option C:** This option is incorrect as articular cartilage is not a type of muscle tissue, but rather a type of connective tissue that provides a smooth surface for joint movement.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that articular cartilage has limited ability to repair itself due to its avascular nature, making early diagnosis and treatment of degenerative joint diseases crucial to prevent long-term damage.
**Correct Answer:** D.