In heavy smokers,the alveoli of the lungs are enlarged and damaged,which reduces the surface area for the exchange of respiratory gases. This condition is called:

  • A
    Asthma
  • B
    Silicosis
  • C
    Emphysema
  • D
    Anosmia

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$A$: Asthma patients must never be exposed to dust. $R$: Allergic response may cause vasoconstriction and death.

In the common cold,which of the following occurs?

Which of the following options correctly represents the lung conditions in asthma and emphysema,respectively?

The increase in the incidence of asthma during certain seasons is primarily due to:

Select the correct option:
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