Respiratory and circulatory system

Which are the main organs in the respiratory system?

• liver

• trachea

• lungs

• nasal cavity

What kind of gas do we breathe in?

When we breathe out the diaphragm

• contracts

• relaxes

Write the parts of respiratory system

Where does gas exchange take place?

Can you explain the function of the heart?

Arteries transport oxygenated blood around the body

• True

• False

How many kind of blood vessels do we have in our circulatory system?

• one

• two

• three

• four

Complete: Veins...

• carry the blood to every part of the body

• carry blood back to the heart

• Connect arteries with capillaires

Write at least three actions that keep the heart healthy.