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Mechanism of Breathing

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Question

Name the important parts involved in creating a pressure gradient between lungs and the atmosphere during normal respiration.

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Solution

The diaphragm and a specialised set of external and intercostals muscles between the ribs, help in the generation of pressure gradient during normal respiration.

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Similar questions

Q. Assertion :The abdominal muscles are primarily involved in generating pressure gradient between the lungs and the atmosphere. Reason: The strength of inspiration and expiration can be increased by additional muscles in diaphragm and intercostal muscles.

Q. During expiration the pressure within the lungs is ________with respect to the atmosphere.

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. Choose the correct answer from the alternatives given.
The amount of air that enters lungs during normal respiration is

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.

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