Which of the following statements is correct regarding human respiration?

  • A
    Cigarette smoking causes inflammation of the bronchi.
  • B
    Neural signals from the pneumotaxic center in the pons region of the brain increase the duration of inspiration.
  • C
    Workers in grinding and stone-breaking industries suffer from lung fibrosis.
  • D
    $(A)$ and $(C)$

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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:

In which of the following disorders do the alveoli get filled with fluid, leading to severe problems in respiration?

Due to increasing air-borne allergens and pollutants,many people in urban areas are suffering from respiratory disorders causing wheezing due to:

Match the names of diseases listed under Column $I$ with their meanings given under Column $II$,and choose the answer that provides the correct combination.
Column $I$ (Name of disease) Column $II$ (Meanings)
$(A)$ Jaundice $(p)$ Allergic inflammation of nose
$(B)$ Stenosis $(q)$ Loss of motor functions
$(C)$ Rhinitis $(r)$ Heart valve defect
$(D)$ Paralysis $(s)$ Increase in bile pigments in the blood
$(t)$ Septal defect of heart

Which of the following is a characteristic of emphysema?

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