The Significance of Homeostasis to the Human Body Essay

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The Significance of Homeostasis to the Human Body

What is homeostasis?

According to the 'Oxford Colour Medical Dictionary, Third Edition' homeostasis is the "the physiological process by which the internal systems of the body (e.g. blood pressure, body temperature, acid-base balance) are maintained at equilibrium, despite variations in the external conditions"

Homeostasis is the maintenance of a stable internal environment within tolerance limits, this is the restricted range of conditions where cellular operations effectively work at a consistent rate and maintain life.

These conditions include temperature, blood glucose levels, pupil diameter control and many more.

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In general the combined activities of the specialised systems provide the optimum environment for individual cells. This means the preservation of a constant composition of the fluid that bathes the body cells i.e. tissue fluid. This situation is for health and is called homeostasis.



"Maintaining homeostasis is more complicated than it appears at first glance. Virtually every organ system plays a role in maintaining the constancy of the internal environment". (3)

Adequate blood levels of essential nutrients must be continuously present, and heart activity and blood pressure must be continuously monitored and adjusted so that the blood is propelled to all body tissues. Wastes must not be allowed to accumulate, and body temperature must be precisely regulated (3)

The internal environment and homeostasis ----------------------------------------

The external environment surrounds the body and provides the oxygen and nutrition required by all body cells. Waste products of cell activity such as carbon dioxide are eventually excreted into the external environment (tissue fluid).

The internal environment provides chemical substances produced by specialised cells. All living cells in the body are bathed in fluid called 'tissue fluid'. Oxygen, nutritional materials, chemicals produced by the

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