Your Freight System
¶ The Thoracic system may be compared to a great freight system, with each of its tributaries—from the main trunk arteries down to the tiniest blood vessels—starting from the heart and carrying its cargo of blood to every part of the body by means of the power furnished by the lungs.
Your Telegraph System
¶ But the nervous system is more like an intricate telegraph system. Its network of nerves runs from every outlying point of the body into the great headquarters of the brain, carrying sense messages notifying us of everything heard, seen, touched, tasted or smelled.
As soon as the brain receives a message from any of the five senses it decides what to do about it and if action is decided on, sends its orders back over the nerve wires to the muscles telling them what action to perform.
Your Working Agents
¶ This latter fact—that the muscles are the working agents of the body—also explains why the Muscular type is naturally more active than any of the others.
Source of Your Raw Materials
¶ The body may be compared to a perfectly organized transportation system and factory combined. The Alimentive system furnishes the raw materials for all the systems to work on.