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Why Do We Need Lungs

When the volu...

Question

When the volume inside the lungs increases, the intrapulmonary pressure .

A

equalises

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B

decreases

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C

increases

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Solution

The correct option is B decreases
Pressure and volume are inversely proportional to each other.
When the pressure increases, the volume decreases and vice versa. Therefore, when the volume inside the lungs increases, the pressure decreases.

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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?

When the lungs expand, they create a region of low pressure inside.

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

Air moves out of the lungs when the pressure inside the lungs is

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