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bronchus

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Bronchus


One of a pair of large tubes (bronchi) branching off from the windpipe (trachea) and passing into the vertebrate lung. Apart from their size, bronchi differ from the bronchioles in possessing cartilaginous rings, which give rigidity and prevent collapse during breathing movements.

Numerous glands in the wall of the bronchus secrete a slimy mucus, which traps dust and other particles; the mucus is constantly being propelled upwards to the mouth by thousands of tiny hairs or cilia. The bronchus is adversely effected by several respiratory diseases and by smoking, which damages the cilia and therefore the lung-cleansing mechanism.

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adenosine triphosphate
aerobic
aerobic respiration
alveolus
anaerobic respiration
ATP
breathing
bronchiole
bronchus
carbon dioxide
cilia
diaphragm (anatomy)
diffusion
energy (biology)
epiglottis
gas exchange
glucose
intercostal
lactic acid
lung
mucus
nicotine
oxygen
oxygen debt
respiration
respiratory tract
smoking (tobacco)
thorax
trachea
ventilation
water

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