Respatory System

Question 1

What is the function of our nose?

Answer 1

We are supposed to inhale through our nose.
The reasons for doing
this are:
• Hairs and mucus trap dirt particles and bacteria in the nose
• Air is warmed and moistened as it passes through the nose.
Warm and moist air helps oxygen to pass from the lungs into the bloodstream more easily.

Question 2

What is the function of the trachea?

Answer 2

The trachea, or windpipe, carries air to and from the lungs. It is made of C-shaped rings of rigid cartilage (to prevent it from collapsing).

Question 3

What is the function of the bronchus and bronchioles?

Answer 3

We have two bronchi. Each bronchus carries air between the trachea and a lung. The two bronchi subdivide many times to form tiny tubes called bronchioles. Bronchioles carry air to and from the air-sacs, or alveoli.

Question 4

What is the function of the alveolus

Answer 4

Each lung contains millions of tiny air-sacs called alveoli.
The function of each alveolus is gas exchange:
• Oxygen passes from the air in the alveolus into the blood vessels
At the same time carbon dioxide and water pass from the blood vessels into each alveolus
• The gases pass in each direction by a process called diffusion.
As an adaptation for diffusion each alveolus has a very thin lining, is moist and is surrounded by many tiny blood vessels called capillaries.