The respiratory system is made up of the Bronchi and Bronchioles; Alveoli; Lungs; Larynx; Pharynx; and Trachea. External respiration occurs when a breath is taken, air passes into the nostrils, through the nasal passages, into the pharynx, through the larynx, down the trachea, into one of the main bronchi, then into smaller broncial tubules, through even smaller broncioles, and into a microscopic air sac called an alveolus. However the internal respiration occurs is the exchange of gasses between the blood in the capillaries and the body’s cells. Disorders also arise in the respiratory system like: lung cancer; asthma; bronchitis; emphysema; pneumonia; tuberculosis; coryza; influenza; pulmonary embolism; pulmonary oedema; and smoke inhalation.
Credit:ivythesis.typepad.com
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