$A$ person at $15000$ feet above sea level develops certain symptoms in $8-24$ hours. These symptoms are:

  • A
    Breathlessness and headache only
  • B
    Dizziness and irritation only
  • C
    Nausea,vomiting,mental fatigue,a bluish tinge on skin,nails,and lips
  • D
    All of the above

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$CO$ (Carbon monoxide) is harmful because:

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.
< strong>Column $I$ (Name of disease) < strong>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

Cigarette smoking causes emphysema. Give reason.

In $emphysema$,what happens to the lungs?

Black lung disease is common among

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