Practice questions

Class : 7
Subject : General Science
Lesson : Human Organ Systems
Chapter : Respiratory System

Score: /4

Inhalation and exhalation of gases which involves a gaseous exchange in lungs is called _________________.

Inhalation and exhalation during which exchange of gases occurs in lungs is called respiration. Oxygen is absorbed while carbon dioxide is given out of the blood.

_______________ are the most important organs for respiration.

Lungs are the most important organs of respiration. Lungs are balloon like structures that inflate and shrink during respiration. Exchange of gases occur inside lungs.

During inhalation, air enters into a long vertical pipe after nasal cavity called ______________.

During inhalation, after nasal cavity, air enters trachea. Trachea is a long vertical pipe that leads the air to bronchi.

After entering into the lungs, both bronchi divide into very small branches called _________________.

After entering into the lungs, both bronchi divide into small branches called bronchioles. Bronchioles distribute air evenly in all parts if the lungs.