![]() ![]() all (usually) without losing balance and while keeping track of the relative position of arms and legs with respect to the rest of the body. Human beings have the ability to walk a tight rope, do repeated pirouettes in a ballet performance, combine twists and turns when diving, or perform triple toe loops while ice skating. The human body has a remarkable ability to sense and determine the direction and speed in which it is moving and maintain balance (postural equilibrium). It is our ability to sense body movement combined with our ability to maintain balance (equilibrium). One of the most powerful of the other senses is the vestibular sense, provided by the vestibular system. (Touch itself includes heat, cold, pressure, and pain.) Actually, there are many other senses - hunger, thirst, kinesthetic, etc. We are all familiar with the question, "How many senses do humans have?" The answer we hear most often is five: sight, taste, smell, hearing, and touch. If our senses are not providing us with reliable information, we may take an action which is inappropriate for the circumstances and this could lead to injury or death. Organisms, including humans, must sense accurately before they can react, thus ensuring survival. All living organisms on Earth have the ability to sense and respond appropriately to changes in their internal and external environment. ![]() The presence of sensory and response systems is a universal attribute of life as we know it. How does the human body maintain a sense of body position and balance on Earth, while flying in an airplane, or traveling through space? ![]()
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