Oxford Discover 4 - Unit 12

What do we breathe out of our mouths?

What is smaller than an artery or a vein?

What carries oxygen throughout our body?

What lets air into our lungs?

What system brings oxygen into our body and takes carbon dioxide out of our body.

What system carries oxygen and food to all of the cells in our body?

Each s _ s t _ m in our body has many parts working together.

(a)  

Complete the sentence.

The major parts of the respiratory system are trachea, the ______, and the diaphragm.

Complete the sentence.

The major parts of the circulatory system are the heart, the arteries, the veins, the capillaries, and the _________.

It describes important actions that happen in a specific order.