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Define respiratory system in human beings |
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Answer» Respiratory system of human beings and other mammals consists of air passage or respiratory tract, a pair of lungs.Respiratory tract is made up of nasal cavity, pharynx, larynx, trachea and bronchi.\xa0\xa0The lungs are a pair of brownish grey coloured spongy structures situated in the thoracic cavity.The left lung consists of two lobes while the right lung consists of three lobes.Each lobule of a lung consists of bronchioles which terminate into a bunch of spherical thin-walled air sacs, called alveoli.Each alveolus or air has a diameter of 75 to 300 microns and has a very thin wall. The walls of the alveoli are elastic and are supplied with capillaries. Through these thin walls gases are exchanged between the capillaries and the air sacs. Sia how have u posted this... i mean to say the picture ???? |
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