Smoking can, or Vitamin A deficiency (since vitamin A is essential for epithelium differentiation)
asthma
Mucus (snot).
Chronic bronchitis is often caused by smoking. Smoking causes the bronchial tubes to become inflamed and mucus production to increase.
Congestion in the lungs or (more likely) bronchial tubes.
Chronic bronchitis
cilia
Asthma causes contraction of the bronchial smooth muscle.
Bubble bath residue and epithelial tissue.
Squamous cell carcinoma
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because it wants toExplain the way anatomical shunt through the bronchial circulation causes an PO2 difference between alveolar gas and arterial blood.? In: Circulatory System [Edit categories]