Explain how increasing the chest volume will force air to flow into the lungs. I

Question

Explain how increasing the chest volume will force air to flow into the lungs. If the rubber membrane of the bell jar model lung were accidentally punctured by sharp nails, what would be the effect on the two balloons? If the chest volume decreased during an inhalation instead of increasing, what might be some reasons? What is the relationship between the components of TLC? What is the relationship between the components of VC? What are two ways for MRV to increase? Describe the damage to specific parts of the respiratory system in these disorders: a. emphysema

Explanation / Answer

Que 8

Ans:

Increasing the chest volume will force air to flow into the lungs:

- Inhalation of air into lung is brought about by chest expanding.

- It takes place when the volume of the thoracic cavity increases and the air pressure decreases.

- Enlargement of thoracic cavity involves the following events which occur simultaneously.

a) During inspiration, the external intercostal muscles contract and the internal one relax.

b) Due to contraction of external intercostal muscle, the ribs are pulled upward and outward.

c) The muscle of diaphragm contract which lowers the diaphragm.

d) As a result size of thoracic cavity increases as well as the lungs expand simutaneously.

e) As the lung expand, the air pressure inside the lung decreases.

f) In order to balance the air pressure, air rushes from atmosphere into the lungs through air passages.

The process of inspiration is active, as it needs energy for muscle contraction. At rest, it lasts about 2 sec.

  

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