Biology, 28.08.2019 20:40, shaunalab

Asthma narrows airways to the lungs and in the lungs by contraction of muscles around the air passages, swelling of the airway lining, and build-up of excessive mucus. because of this, asthma makes both the and systems work harder to deliver oxygen to the cells throughout

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Asthma narrows airways to the lungs and in the lungs by contraction of muscles around the air passag...