## Chapter Chosen

Breathing and Exchange of Gases

## Book Store

Currently only available for.
CBSE Gujarat Board Haryana Board

## Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12
Discuss the functions of respiratory tract.

Functions of respiratory tract :

1. The cartilages in the trachea keep the respiratory tract extended, allowing for the unobstructed passage of air between the outside atmosphere and the alveoli of the lungs.

2. The mucus lining keeps the respiratory passage moistened and traps particles as dust in the air preventing them from reaching the alveoli.

3. The diameter of the respiratory passages may be altered by muscles in their walls, thus regulating the volume of air entering the lungs.

4. Cells in connective tissue protect against infection and inhaled foreign particles not trapped by mucus. Lymphocytes and plasma cells produce antibodies in the presence of antigens, and macrophages and polymorphonuclear leukocytes are phagocytic.

5. The respiratory tracts maintains the temperature of the air.

130 Views

70% of carbondioxide is transported as ?

Bicarbonate
360 Views

Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
415 Views

Name the cavity having lungs.

Thoracic cavity.
448 Views

What is the partial pressure of oxygen in  oxygenated blood ?

95 mm Hg
702 Views

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

20 - 25 times
414 Views