bronchioles Small tubes in the lungs that are formed by the branching of the bronchi; terminate in the alveoli.
The intrapulmonary bronchi divide and subdivide throughout the entire organ, the smallest subdivisions constituting the lobular bronchioles.
The bronchi continue to divide within the lung, and after multiple divisions, give rise to bronchioles. The bronchial tree continues branching until it reaches the level of terminal bronchioles, which lead to alveolar sacks.
Bronchi branch into smaller and smaller tubes known as bronchioles. Bronchioles terminate in grape-like sac clusters known as alveoli. Alveoli are surrounded by a network of thin-walled capillaries. Only about 0.
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.
Bronchi further divide into bronchioles
Their diameter can be controlled by smooth muscles
Bronchial tubes form a system called alveoli (100µm in diameter)
Alveolar Gas Exchange ...
Any one of a group of drugs which prevent or control spasms and narrowing of the lung's bronchi and bronchioles.
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An alveolus is an anatomical structure that has the form of a hollow cavity. Found in the lung, the pulmonary alveoli are spherical outcroppings of the respiratory bronchioles and are the primary sites of gas exchange with...
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(bronk-us, bronk- eye) [Gk. bronchos, windpipe]
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.
 See also: Bronchi, Human, Lungs, Membrane, Tissue
  
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