A wheelchair is a mobile chair with large wheels and brakes used for people who cannot or should not walk on their own. The chair usually has foot pads, to allow support of the feet off the floor, that can be folded back when not in use, such as when a patient wheels up to a table or is otherwise stationary. Wheelchairs can be specially equipped to accommodate long-term use, such as padded seats, adjustable height armrests, and even specialized control systems (the "electric" wheelchair) that can be operated by either the left or right hand, the |mouth|, or even |teeth| movements. These chairs can even accommodate additional accessories, such as an oxygen tank or an intravenous drug drip bag, to allow the patient more freedom of movement. Wheelchairs have evolved from the very heavy, cumbersome chair of the last century to chairs that are of lighter weight, more easily maneuverable, and portable. Wheelchairs are also made in different sizes to accommodate people of various heights, from young children to tall adults, and today most can be folded in on themselves for storage or transporting. There are even wheelchair racks available for attaching to an automobile to assist in transporting a chair.
