Our Environment Its Relation to Us

Cover Our Environment Its Relation to Us
Our Environment Its Relation to Us
Harry a Harry Allen Carpenter
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WHAT KEEPS THE HUMAN MACHINE OPERATING SMOOTHLY? 164. The Control Center of the Body. Running all through the human body is a system of long and short fibers somewhat like the many wires running to a tele- phone exchange. These fibers, called nerves, perform much the same service as the telephone wires, that is, they carry messages. For example, when you cut your finger, a rapid exchange of messages takes place in the nervous system and you jerk your finger away from the sharp edge as quickly a...s you can. The message to save your finger is only one of many, many ways in which the nervous system serves you. Every movement of a muscle, every response of the five senses (seeing, hearing, tasting, smelling, and feeling) is controlled by some action in the nervous system. It 31. 9 320 Control Centers of the Human Machine is the control center of all you feel and do and so you ought to know some of the important facts about it. 165. Parts of the Nervous System. The nervous system acts in two ways : (1) as a result of thought in the brain, and (2) by automatic response of certain cells in the spinal cord to messages which do not require action of the brain.

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