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Lungs do not collapse between breaths an...

Lungs do not collapse between breaths and some air always remains in the lungs, which can never be expelled because

A

Pressure in the lungs is higher than the atmospheric pressure

B

There is a negetive pressure in lungs

C

There is a negetive intrapleural pressure pulling at the lung walls

D

There is a positive intrapleural pressure

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • A and B are two identical point sources of acoustic waves, each producing sound of 1 kHz. They are located in two trains, one in each of the engines of the trains which runs on two close parallel . An observer is standing in between the tracks and listening to the sound received from of the sources. If one of the trains remains stationary while the other train recedes from the observer with a speed which is 1% of the velocity of sound in air, the number of beats heard by the observer per seconds will be (in Hz)

    A
    0
    B
    greater than 10
    C
    3.5
    D
    9.9

  • Lungs are made up of air filled sacs the alveoli. They do not collapse even after forceful expiration because of

    A
    Inspiratory Reserve Volume
    B
    Tidal volume
    C
    Expiratory Reserve volume
    D
    Residual volume

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