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Why Do We Need Lungs

The volume of...

Question

The volume of lungs is directly related to intrapulmonary pressure. When volume increases, pressure also increases.

A

True

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B

False

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Solution

The correct option is B
False

Volume is inversely related to pressure. During inhalation, air comes in as a result of decreases in intrapulmonary pressure and increase in lungs volume.

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Similar questions

Q. Read the following statements regarding the mechanism of respiration and choose the correct option.

1

. Inspiration occurs only when there is negative pressure in the lungs with respect to the atmosphere.

2

. Expiration takes place only when intrapulmonary pressure is lower than atmospheric pressure.

3

. Pressure gradients are generated with the help of the diaphragm and intercostal muscles.

4

. Inspiration is initiated by the relaxation of the diaphragm.

5

. Contraction of the diaphragm reduces pulmonary volume and increases intrapulmonary pressure causing expiration.

Q. When the volume of lungs increases then how the pressure decreases and when the volume of lungs decreases how the pressure increases?

Q. Which of the following sequences is correct to initiate inspiration?
(i) The contraction of external intercostal muscles raises the ribs and sternum
(ii) Volume of thorax increases in the dorso-ventral axis
(iii) Intrapulmonary pressure decreases
(iv) Diaphragm contraction
(v) Air rushes into lungs
(vi) Volume of thorax increases in the anterior-posterior axis

Q. Assertion :Inspiration occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure. Reason: During inspiration, a decrease in pulmonary volume increases the intra-pulmonary pressure than atmospheric pressure which forces the air from outside to move into the lungs.

Q. The volume of the lungs increase, as the air pressure within the lungs decrease.

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Why Do We Need Lungs

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