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Difficulty in breathing on high mountain...

Difficulty in breathing on high mountains is due to

A

Decrease in `pO_2`

B

Increase in `CO_2` concentration

C

Decrease in amount of `O_2`

D

All of these

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • Difficulty in breathing causes wheezing due to constriction of bronchi and bronchioles in case of

    A
    Asthma
    B
    Emphysema
    C
    Bronchitis
    D
    Pneumonia

  • An asthmatic patient has difficulty in breathing. Which of the following would you administer to the patient? Why?

    A
    Histamine to cause vasodilation in the alveoli
    B
    Norepinephrine, to contract smooth muscles in the bronchioles
    C
    Antihistamine, to counteract the broncho-constriction caused by histamine
    D
    Acetylcholine, to cause bronchoconstriction

  • At the top of a mountain a thermometer read 7°C and barometer reads 70cm of Hg. At the bottom of the mountain the barometer reads 76cm of Hg and thermometer reads 27°C. The density of air at the top of the mountain is times the density at the bottom.

    A
    `0.99`
    B
    `0.9`
    C
    `0.89`
    D
    `0.95`

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    At the top of a mountain a thermometer read 7°C and barometer reads 70cm of Hg. At the bottom of the mountain the barometer reads 76cm of Hg and thermometer reads 27°C. The density of air at the top of the mountain is times the density at the bottom.

    At the top of a mountain a thermometer read 7°C and barometer reads 70cm of Hg. At the bottom of the mountain the barometer reads 76cm of Hg and thermometer reads 27°C. The density of air at the top of the mountain is _______ times the density at the bottom.

    At the top of a mountain a thermometer read 7^(@)C and barometer reads 70cm of Hg. At the bottom of the mountain the barometer reads 76cm of Hg and thermometer reads 27^(@)C . The density of air at the top of the mountain is ___ times the density at the bottom.

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