Bronchioles

bronchioles: the branches formed from the bronchi.
C
capillaries: the microscopic blood vessels between the arteries and the veins.
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bronchioles Small tubes in the lungs that are formed by the branching of the bronchi; terminate in the alveoli.
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Air is brought into the animal via the airways - in reptiles, birds and mammals this often consists of the nose; the pharynx; the larynx; the trachea; the bronchi and bronchioles; and the terminal branches of the respiratory tree.
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The smooth muscle in the walls of the bronchioles is very sensitive to the concentration of carbon dioxide. A rising level of CO2 causes the bronchioles to dilate.
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In lungs, the narrowed ending of bronchioles that opens into a cluster of alveoli.
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In mammals the paired lungs are each supplied by a bronchus that divides, treelike, into bronchioles. Each bronchiole ends in an atrium from which arise numerous alveoli that contact a vast capillary system.
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One of a pair of respiratory tubes branching into either lung at the lower end of the trachea; it subdivides into progressively finer passageways, the bronchioles, culminating in the alveoli.
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