## Chapter Chosen

Breathing and Exchange of Gases

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
List the causes of pneumothorax, haemothorax and pleural effusion.

Pneumothorax : It is the presence of air in the pleural cavity.

Causes : It may be caused by :

1. Penetrating injury, e.g. compound fracture of rib.

2. Rupture of the lung over a diseased area, e.g. emphysema.

3. Therapeutic introduction of air to rest the lung.

Haemothorax : It is the presence of blood in the pleural cavity.

It may be caused by :

1. Penetrating chest injury involving blood vessels.

Pleural effusion (excess fluid in the pleural cavity) : It may be caused by :

1. Inflammation, usually due to infection.

2. Malignant tumour involving the pleura.

125 Views

Name the cavity having lungs.

Thoracic cavity.
448 Views

By what amount the solubility of carbondioxide is more than the solubility of oxygen?

20 - 25 times
414 Views

Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
415 Views

70% of carbondioxide is transported as ?

Bicarbonate
360 Views

What is the partial pressure of oxygen in  oxygenated blood ?

95 mm Hg
702 Views