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Sense_Of_Touch
2013-11-13 来源: 类别: 更多范文
Sense Of Touch
Touch is the first of the senses to develop in the womb. By as early as eight weeks, embryos respond to a gentle touch on the cheek, and by thirty-two weeks, every part of their body is sensitive to touch, pain, and temperature. At twelve weeks or so, babies may begin sucking their thumbs, and soon they will be exploring their world through touch. Your other four senses: sight, hearing, smell, and taste are located in specific parts of the body, but your sense of touch is found all over, and your skin is the largest sensory organ of your body. While there are about one hundred touch receptors in each of your fingertips alone, the sense of touch is essential for every square inch of your body. It involves sensory terminals that are dispersed over the outside and inside of the body. This system encodes a variety of sensations in addition to touch, such as pain, vibration, pressure, stretch, itch, texture, and temperature. The system is sensitive to certain chemical states like painful tissue acidity, the result of inflammation or infection. Each receptor in your skin
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