Blood
Blood – the most important part of the internal environment of the body that performs multiple physiological functions. In the digestive tract, it is enriched with the components of food, dissolved in water, and spread them out throughout the body.
In the lungs, the blood is enriched with oxygen, which is delivered to all organs and tissues where metabolism takes place.
The organs and tissues in the blood to the residual metabolic products, which are delivered by it to the organs of elimination: the kidneys, lungs, skin. Some of the products of metabolism of the body is removed from the digestive system. The chemical composition of blood is largely reflects metabolism.
The blood from the endocrine hormones act exercising humoral interactions between organs and tissues.
The movement of blood through the blood vessels provides a constant alignment of the heat generated as a result of metabolism in tissues and organs, and the preservation of the relative constancy of the temperature.
Blood also performed a protective function entrainment and destruction of microbes, foreign-celled organisms and foreign substances.
Tissue cells are separated from the blood stream and the endothelium layer of connective tissue, blood cells so the body itself does not touch.
Various nutrients in the aqueous solution passes from the blood into the intercellular and interstitial gap, and of the products of metabolism – in the opposite direction to the blood. Fluid in the intercellular and interstitial spaces, continuously moving and enters the lymphatic vessel system, from which it enters the bloodstream. This fluid (lymph), a portion of the blood plasma, passed through the walls of blood vessels into the interstitial space. The movement of lymph cells of the body ensures the delivery of nutrients and oxygen and removing the residual products of metabolism.
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