Respiratory System

Living things on land and in water take in oxygen from their surroundings to stays alive.

Air is a mixture of different gases.

The components of air are oxygen, nitrogen, carbon dioxide, water vapour and other gases

When the air we breathe in reaches the air sacs in our lungs, carbon dioxide enters our blood.

The human

respiratory system consists of the nose, windpipe and the heart.

Fish take in dissolved oxygen in that water that passes through the the gills.

Insects have lungs and they breathe through nostrils.

Plants help to maintain the balance of oxygen and carbon dioxide in the air.

Plants can produce oxygen and take in carbon dioxide when it makes food.

When we run, the muscles in our body need less oxygen than when we walk.

The respiratory system works together with the circulatory system to ensure all parts of our body receive enough oxygen.