The Heart

Question 1

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

Question 2

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

Alveolus

Answer 3

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.

Question 4

Bronchus and bronchioles

Answer 4

Bronchus and bronchioles
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 5

Diaphragm

Answer 5

Diaphragm
The diaphragm is a sheet of muscle that forms the base of the chest. Along with the ribs and
intercostal muscles (located between the ribs) the diaphragm causes air to move into or out
of the lungs.