Conde Library: Body Systems Year 9: Respiratory System

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Respiratory system
Respiratory system, the system in living organisms that takes up oxygen and discharges carbon dioxide in order to satisfy energy requirements. In the living organism, energy is liberated, along with carbon dioxide, through the oxidation of molecules containing carbon.
Respiratory System
The respiratory system works with the circulatory system to bring in oxygen to the body and release carbon dioxide. This system acts to bring in air from outside the body, filter it, moisten it, warm it and bring it into contact with small capillaries of circulatory system.
The Human Respiratory System
We breathe in and out between 15 and 25 times each minute, but we rarely consider how this automatic process works. Breathing is the means by which carbon dioxide is eliminated and oxygen taken into the body.
Lungs and Respiratory System
The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation).

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Respiratory system. Illustration of the human respiratory system showing the lungs, diaphragm, and heart. At top the sectioned head shows the brain (grey and yellow) where respiration is controlled. Bone is speckled white. Leading down from the mouth is the trachea (blue). Air comes down the trachea and through the bronchi (blue, branching) into the lungs (pink). Beneath the lungs the downward contraction (arrows) of the muscular diaphragm (pink) makes the lungs fill. Between the lungs is the heart (red). Deoxygenated blood returning to the heart is shown in the blue vessels at left (vena cava) and right (pulmonary artery). The main artery (aorta) is in red.