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Encyclopedia > Bronchiole
Diagram of the alveoli with both cross-section and external view.
Gray's subject #240 1098
Dorlands/Elsevier Bronchioles/A04.411.125

The bronchioles are the first airway branches that no longer contain cartilage. They are branches of the bronchi, and are smaller than one millimeter in diameter. A diagram of the alveoli, both in cross section and externally. ... The alveoli (singular:alveolus), tiny hollow sacs which are continuous with the airways, are the sites of gas exchange with the blood. ... Elseviers logo. ... The airways are those parts of the respiratory system through which air flows, to get from the external environment to the alveoli. ... Cartilage is a type of dense connective tissue. ... A bronchus (plural bronchi, adjective bronchial) is a caliber of airways in the the respiratory tract that conducts air into the lungs. ... A millimetre (American spelling: millimeter), symbol mm is an SI unit of length that is equal to one thousandth of a metre. ...

There are no glands or cartilage in any of the bronchioles, and the epithelial cells become more cuboidal in shape. A gland is an organ in an animals body that synthesizes a substance for release such as hormones, often into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland). ... In zootomy, epithelium is a tissue composed of a layer of cells. ... Cuboidal epithelia are cube-shaped epithelial cells present in single layers (Simple cuboidal epithelium) or multiple layers (Stratified cuboidal epithelium), depending on their location in the body. ...

They are circular bubbles at the end of the bronci.


Bronchospasm, a life-threatening situation, occurs when the smooth muscular tissue of the bronchioles constricts, severely narrowing their diameter. Bronchospasm is commonly treated by oxygen therapy and bronchodilators. Bronchospasm is a difficulty in breathing caused by a sudden constriction of the muscles in the walls of the bronchioles. ... Oxygen first aid kit showing a demand valve and a constant flow mask Oxygen therapy is the administration of oxygen as a therapeutic modality. ... A bronchodilator is a medication intended to improve bronchial airflow. ...

The medical condition of inflammation of the bronchioles is termed bronchiolitis. Diseases of the bronchioles include asthma, bronchiolitis obliterans, respiratory syncytial virus infection, and influenza. Bronchiolitis is inflammation of the bronchioles, the smallest air passages of the lungs. ... Bronchiolitis obliterans is a disease of the lungs in which the bronchioles are plugged with granulation tissue. ... The respiratory syncytial virus (RSV or RS virus) causes a common viral infection of infants and young children. ... Influenza, commonly known as flu, is an infectious disease of birds and mammals caused by an RNA virus of the family Orthomyxoviridae (the influenza viruses). ...

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  Results from FactBites:
Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells (376 words)
Refer to Figure 11A which can be used in conjunction with this plate in order to follow the structural changes that occur from the respiratory bronchiole to alveolar ducts to alveolar sacs where gaseous exchange takes place.
Respiratory bronchiole: A branch of the terminal bronchiole.
Accompanying arterioles and venules are seen in the wall of the bronchiole.
Bronchiole definition - Medical Dictionary definitions of popular medical terms (0 words)
Bronchiole: A tiny tube in the air conduit system within the lungs that is a continuation of the bronchi and connects to the alveoli (the air sacs) where oxygen exchange occurs.
Bronchiole is the diminutive of bronchus, from the word bronchos by which the Greeks referred to the conduits to the lungs.
Bronchiolitis is inflammation of the bronchioles and is most commonly due to viral infections.
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