Respiratory System

External respiration is the intake of oxygen from the air and releasing of carbon dioxide from the _____.

Define internal respiration.

What are the functions of the windpipe?

The trachea is also known as _____.

The front opening of the windpipe is guarded by _____.

Define windpipe.

The lungs contain millions of minute bronchi.

Which of the following is not a part of the human respiratory system ?

Name the organ of the body which is protected by the rib cage.

Name the spongy organ where the exchange of gases occurs in land animals.

. A doctor kept records of breathing rates of people when they were resting. He made the chart given below. The chart suggests that

Cross (x) out the wrong words in the brackets to make the correct statement.

The tiny tubes inside the lungs are (bronchi/tracheae). 

Tiny tubes inside the lungs are

Oxygen combines with haemoglobin to form _____.

Human lungs are covered by a double membrane called _____.

The two branches of the windpipe carry oxygen to the two lungs.