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Why Do We Need Lungs

Which of the ...

Question

Which of the following statements about expiration is correct?

A

It occurs when the intra-pulmonary pressure is higher than the atmospheric pressure

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B

It occurs when the intra-pulmonary pressure is lower than the atmospheric pressure

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C

During this process, the volume of the thoracic chamber increases

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D

During this process, the pulmonary volume increases

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Solution

The correct option is A
It occurs when the intra-pulmonary pressure is higher than the atmospheric pressure

Expiration occurs when the intra-pulmonary pressure is higher than the atmospheric pressure. As a result, air is expelled from the lungs.

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Similar questions

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. Fill up the blanks in the following paragraph by selecting the correct option.
The movement of air into and out of the lungs is carried out by creating a ____(i)____ between the lungs and the atmosphere. Inspiration can occur if intra-pulmonary pressure is ___(ii)____than the atmospheric pressure. Expiration takes place when the intra-pulmonary pressure is ___(iii)___ than the atmospheric pressure. Inspiration is initiated by the ___(iv)___ of diaphragm which ____(v)____ the volume of thoracic chamber in the anteroposterior axis.

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. Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external intercostal muscles
(c) Pulmonary volume decreases
(d) Intra-pulmonary pressure increases

Q. How many of the following given statements are not correct w.r.t. the events that occur during inspiration?
(a) Relaxation of diaphragm
(b) Contraction of external inter-costal muscles
(c) Volume of thoracic cavity decreases
(d) Intra-pulmonary pressure increases

Choose the suitable option among the following given options.

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