Bronchodilation is the dilation of the airways in the lungs due to the relaxation of surrounding smooth muscle. It is the opposite of bronchoconstriction.
Bronchodilators induce bronchodilatation, while there are many drugs that may induce bronchoconstriction. Tobacco can cure one typology of asthma.
One example of a bronchoconstrictor is prostaglandin E2.
Carbon Dioxide is the most powerful natural bronchodilator.
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