<prompt> Synol fluids of normal joints are usually devoid of collagen. Patients with rheumatoid diseases have various types of collagen in their synol fluid, depending on the tissue being damaged. If a patient has type II collagen in the synol joint, which of the following tissues is being eroded?Vascular EndotheliumCompact BoneVascular Smooth MuscleAicular Cailage  <response>: Type II collagen is present only in Hyaline and Elastic Cailages. Finding of type II collagen in the synol fluid of a joint indicates erosion of the aicular cailage. TYPE LOCATION Type I Dermis, tendon, ligaments and bone Type II Cailage, vitreous body, nucleus pulposus Type III Skin, vessel wall, reticular fibre of most tissues lungs, liver, spleen... Type IV Basement membrane 