Chondrocytes in lacunae are the only cells that make up the cartilage. They secrete the cartilage matrix and are kind of embedded in them. Cartilage matrix is made mainly of proteoglycans and collagen. Chondrocyte is round or polygonal in shape. More the number of chondrocytes, bendier the cartilage. Cartilage has many functions one of which is to reduce the friction between bones.
<u>Epidemiology</u> provided the first solid evidence that smoking caused cancer and heart disease and has continued to yield information on the health effects of this very human habit.