Respiratory System

What is the respiratory system?

The body's breathing system

The body's system of nerves

The body's food-processing system

The body's blood-transporting system

Air can enter the body and travel to the lungs ...

through the mouth and the nose

through the oesophagus and gullet

through the windpipe and the pores

through the nose and the nervous system

What is the purpose of the little hairs inside the nose?

To fight disease.

They serve no purpose.

To keep dust out of the lungs.

To tickle the nose and cause sneezes.

What is another name for the windpipe?





What happens to the windpipe, or trachea, before it reaches the lungs?

It branches in two directions.

It branches in three directions.

It vibrates and creates sounds.

It closes up so that no oxygen can escape.

What important activity takes place in the lungs?

Food is digested.

Liquid waste is filtered from the blood.

Oxygen is exchanged for carbon dioxide.

The trachea is exchanged for the larynx.

Oxygen moves from the lungs into the bloodstream through ...

nerve fibres

a large artery in the heart

small blood vessels in the lungs

a tube in the lungs called the jugular vein

When we breathe in, we inhale many gases, including oxygen. What happens to the gases that the body can't use?

They are exhaled.

They are changed into oxygen by the lungs.

They circulate through the body and are disposed of later.

They are absorbed into the digestive system and
used to create energy.

Which organ is made up of air-carrying tubes and tiny sacs?

The brain

The lungs

The stomach

The diaphragm

What body structure protects the lungs from outside harm?


Tiny sacs

The rib cage

The diaphragm

To go on living, the body's cells need food, water, chemicals, and ...




carbon dioxide

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