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The Human Body

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The Human Body It is easy to take our own bodies for granted. We feed ourselves, keep ourselves clean and warm and are reasonably careful to avoid injury, but otherwise we don't think about how our body works, though we are concerned about our outside appearance.

But inside, our bodies are miraculous living machines capable of growth, self-repair and reproduction, while at the same time carrying around the most sophisticated computer that has ever been developed -the human brain.

Like other animals, our bodies are constructed from billions of tiny cells, each behaving like a separate little animal, but each also containing the blueprint for an entire person. Masses of similar cells are grouped together into tissues, and different tissues are combined together into organs with specific functions, s uch as a gland or an eye.

The complexity does not stop there. Organs form parts of systems that run the body. The circulatory system, for example, consists of the heart, lungs, blood and blood vessels, while the excretory system contains kidneys and bladder, together with various connecting tubes.

This whole massive and complex collection is kept running by the brain and the nervous system which connects to all parts of the body and monitors and controls its functions. Sub-systems allow parts of the body to run themselves, using chemical messengers to switch organs on and off like machines in a giant factory which must be kept running smoothly.

Tags: human, organs, cells

Category: Education  - ( Education Archive)

Date Added: 21 December '11

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