Oxford Discover 4 - Unit 12

What do we breathe out of our mouths?

• blood

• oxygen

• carbon dioxide

What is smaller than an artery or a vein?

• heart

• trachea

• capillary

What carries oxygen throughout our body?

• blood

• veins

• heart

What lets air into our lungs?

• capillary

• trachea

• pulse

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

• Circulatory System

• Respiratory System

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

• Circulatory System

• Respiratory System

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.

• lungs

• blood

• bones

Complete the sentence.

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

• lungs

• blood

• trachea

It describes important actions that happen in a specific order.

• nonfiction

• sequence

• fiction