Human beings have closed circulation system implying that blood does not leave the blood vessels system which consists of veins, arteries and capillaries (Universereview.ca, 2010). Humans have four heart chambers resulting to a two circuits that is pulmonary and systemic (Double circulation system).
The air enters through the nostrils to lungs then to the heart, is absorbed in the blood arteries which transports oxygen (apart from pulmonary arteries) to the body (Chandra, 2010). The carbon dioxide from the body tissues is carried by blood through the veins (except pulmonary veins) to the heart to the lungs and finally to nostrils (Chandra, 2010).
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