To sustain life, the human body must develop sufficient energy. Power is produced by burn molecules in food, i beg your pardon is excellent by the process of oxidation (whereby food molecule are merged with oxygen). Oxidation involves carbon and hydrogen being merged with oxygen to kind carbon dioxide and water. The usage of oxygen and also the production of carbon dioxide are for this reason indispensable come life. It follows that the human body must have an organ device designed to eliminate carbon dioxide exchanging Oxygen and Carbon Dioxide The primary function of the respiratory mechanism is to take in oxygen and eliminate carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. The great of cells lining the alveoli... read much more from the circulating blood and absorb oxygen from the atmosphere at a rate rapid sufficient for the body’s needs, even during peak exercise. The respiratory tract system enables oxygen to enter the body and also carbon dioxide to leave the body.

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The respiratory device starts in ~ the nose and also mouth and continues v the airways and the lungs. Air enters the respiratory system through the nose and mouth and passes under the neck (pharynx) and through the voice box, or larynx. The enntrance gate to the larynx is covered by a little flap of organization (epiglottis) that automatically closes throughout swallowing, thus avoiding food or drink indigenous entering the airways.

The windpipe (trachea) is the biggest airway. The trachea branches right into two smaller airways: the left and also right bronchi, which lead to the 2 lungs.

each lung is separated into part (lobes): three in the best lung and two in the left lung. The left lung is a little smaller than the best lung because it shares room in the left side of the chest through the heart.


The bronchi us branch many times right into smaller airways, finishing in the narrowest airways (bronchioles), which room as little as one fifty percent of a millimeter (or 2/100 of one inch) across. The prayer resemble an upside-down tree, i beg your pardon is why this part of the respiratory system is often called the bronchial tree. Huge airways are held open by semiflexible, fibrous connective tissue referred to as cartilage. Smaller sized airways space supported by the lung tissue that surrounds and also is attached come them. The walls of the smaller airways have a thin, circular layer of smooth muscle. The airway muscle deserve to relax or contract, thus an altering airway size.

Thousands that small wait sacs (alveoli) space at the finish of every bronchiole. Together, the numerous alveoli that the lungs kind a surface of much more than 100 square meters (1111 square feet). Within the alveolar wall surfaces is a dense network of tiny blood vessels referred to as capillaries. The extremely thin obstacle between air and also capillaries permits oxygen to move from the alveoli right into the blood and allows carbon dioxide to move from the blood in the capillaries right into the wait in the alveoli.

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The pleura is a slippery membrane the covers the lungs as well as the inside of the chest wall. It allows the lung to move smoothly throughout breathing and also as the person moves. Normally, the 2 layers that the pleura have only a tiny amount the lubricating fluid in between them. The 2 layers glide smoothly end each other as the lungs adjust size and shape.