Vitamin A is one of many important vitamins required for the human body. It is a fat soulble vitamin, which is essential to maintain good health. Structurally it is a bi-polar molecule formed with bi-polar covalent bonds between carbon and hydrogen. Vitamin A can exist in several forms like esters, aldehydes or even as an acid. All forms of vitamin A have a beta-ionone ring to which an isoprenoid chain is attached which...

Cartilage is usually found on the articular surface of the bones, rib cage, ear, nose, bronchial tubes and the intervertebral discs. Cartilage is made of collagen fibers, abundant ground substance which is rich in proteoglycan and ealstin fibers. The cartilage does not have blood vessels. The chondrocytes are fed by the technique of diffusion, which is supported by the pumping action generated by compression of the articular...

In anatomical and histological terms, blood is considered a specialized form of connective tissue, because of its origin in the bones and the presence of molecular fibers in the form of fibrinogen. An average adult human is known to contain 5 liters of blood in the body. Blood is usually referred to as a bodily fluid that can deliver necessary substances to various cells in the body. Almost all the cells in the body depend...

Rheumatoid arthritis (RA) is a long term disorder of the joints which is associated with pain and inflammation in the affected joints. Most commonly noted in older individuals, rheumatoid arthritis is often noted to affect the joints of the wrists, fingers, and feet. The affected joints feel swollen, stiff and are painful to touch or move. Other symptoms such as tiredness, inability to sleep and fever are also noted in...