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Lungs are made up of air filled sacs th...

Lungs are made up of air filled sacs the alveloi they do not collase even after forceful expeiration because of

A

Residual volume

B

Inspiratory reserve volume

C

Tidal volume

D

Expiratory reserve volume

Text Solution

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The correct Answer is:
A
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Lungs are made up of air-filled sacs, the alveoli . They do not collapse even after forceful expiration because of

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Knowledge Check

  • Read the following four statement (i) - (iv) with certain mistakes in two of them. (i) A water breather expends much more energy in ventilating its respiratoru surface than an air-breathing one. (ii) Lungs become empty after forceful expiration. (iii) Exchange of gases in the lungs are interrupted during expiration. Respiratory movement are controlled by CO_(2) concentration of arterial blood. Which of the above two statements have mistakes ?

    A
    `(i)` and `(iv)`
    B
    `(ii)` and `(iii)`
    C
    `(i)` and `(ii)`
    D
    `(iii)` and `(iv)`

  • Consider the following statements each with two blanks. (i) Actually, only about overset((1))"_____" mL of air enters the lungs alveoli for the exchange of gases. The remaining fills the respiratory passage and is termed overset((2))"_____" . (ii) The amount of air which one can inhale with maximum effort and also exhale with maximum effort is termed as overset((3))"_____" . It is about overset((4))"_____" in normal adult person. (iii) During normal quiet breathing, on an average, approximately overset((5))"_____" mL of air is inspired or expired by adult human male in each breath. It is termed as overset((6))"_____" volume. Which of the following options gives the correct fill ups for the respective blanks numbers from (1) to (6) in the above statement ?

    A
    `(3)`-vital capacity, `(4)-4000` mL, `(5)-500, (6)-`tidal
    B
    `(1)-100`, `(2)`-residual volume, `(3)-`functional residual capacity, `(4)-3000 mL`
    C
    `(1)-350`, `(2)`-dead space air, `(5)-1000, (6)`-inspiratory reserve
    D
    `(1)-350`, `(2)`-residual volume, `(3)-`vital capacity `(4)-4000 mL`

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    Air entering the lungs ends up in tiny sacs called alveoli.From the alveoli, the oxygen diffuses into the blood. The average radius of the alveoli is 0.0050 cm and the air inside contains 14 per cent oxygen. Assuming that the pressure in the alveoli is 1.0 atm and the temperature is 37^(@)C , calculate the number of oxygen molecules in one of the alveoli.

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