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In humans and other mammals, the anatomy of a typical respiratory system is the respiratory tract.The tract is divided into an upper and a lower respiratory tract.The upper tract includes the nose, nasal cavities, sinuses, pharynx and the part of the larynx above the vocal folds.
Real-time magnetic resonance imaging of the human thorax during breathing X-ray video of a female American alligator while breathing. Breathing (spiration [1] or ventilation) is the rhythmical process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly to flush out carbon dioxide and bring in oxygen.
In mammals, invertebrates and most fish, [1] [2] the anus (pl.: anuses or ani; from Latin, 'ring' or 'circle') is the external body orifice at the exit end of the digestive tract (), i.e. the opposite end from the mouth.
A drawing of a cat by T. W. Wood in Charles Darwin's book The Expression of the Emotions in Man and Animals, described as acting "in an affectionate frame of mind". ...
English: The respiratory system in a bird, showing lungs, abdominal air sac, anterior thoracic air sac, cervical air sac, clavicular air sa, humeral diverticulum of the clavicular air sac, paranasal sinus, posterior thoracic air sac, paratympanic sinus, and trachea.