For human beings, this most commonly involves remaining upright and steady on the feet: "He lost his balance on the icy side walk and broke his wrist as he fell down."
2. A condition in which two opposing forces or factors are of equal strength or importance so that they effectively cancel each other out and maintain stability.
3. To achieve or to maintain, or to cause someone or something to achieve or to maintain, a position of steadiness while resting on a narrow base.
4. An instrument used in laboratories and pharmacies to measure the mass or weight of a body.
A balance functions by measuring the force of gravity that the earth exerts on an object; such as, its weight.
Since the mass of an object is directly proportional to its weight, a balance can also be used to measure mass.5. In medicine, a biological system which lets us know where our bodies where ever we are and to keep a desired physical position.
Normal balance depends on information from the inner ear, other senses; such as sight and touch, and muscle movements.
A person's sense of balance is specifically regulated by a complex interaction between the following parts of the nervous system:
- The inner ears, the labyrinth, monitor the directions of motions; such as, turning or forward-backward, side-to-side, and up-and-down motions.
- The eyes observe where the body is in space; that is, upside down, right side up, etc., and also the various directions of motion.
- Skin pressure receptors; such as, those located in the feet and seat sense what part of the body is down and when it is touching the ground.
- Muscle and joint sensory receptors report what parts of the body are moving.
- The central nervous system (including the brain and spinal cord) processes all the pieces of information from the four other systems to make some kind of functional sense our of the various bodily messages.