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Standard XII
Biology
Total Lung Capacity
Inspiration o...
Question

Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This negative pressure is achieved when

A
intrapulmonary pressure is less than the atmospheric pressure
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B
intrapulmonary pressure is greater than the atmospheric pressure
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C
intrapulmonary pressure is equal to the atmospheric pressure
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D
intrapleural pressure becomes more than the intra-alveolar pressure.
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Solution

The correct option is A intrapulmonary pressure is less than the atmospheric pressure
Because of the pressure gradient between the lungs and the atmosphere, the air moves into and out of the lungs. Inspiration occurs if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure i.e. there is a negative pressure in the lungs with respect to atmospheric pressure.

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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. Inspiration occurs when the pressure within the lungs is the atmospheric pressure.
Q.

The water boils when :

1.Saturated vapour pressure of water becomes equal to atmospheric pressure

2. Boiling point of water becomes more than atmospheric pressure

3. Saturated vapour pressure of water is less than atmospheric pressure

4. Vapour pressure of water becomes more than atmospheric pressure

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. 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.
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