Practice Quiz: Respiratory System and Circulatory System

The __________ system carries oxygen and nutrients to all parts of our bodies.

• respiratory

• circulatory

What does the circulatory system help our blood carry away from our body?

• oxygen

• hydrogen

• carbon dioxide

• helium

What is the main organ of our circulatory system?

• heart

• lungs

• skin

• liver

What do we call the movement of

blood through the heart and around the body?

• circulation

• transportation

• digestion

• breathing

What do we call the tiny tubes that return oxygen

poor blood back to the heart?

• arteries

• chambers

• veins

• ventricles

We breathe out ________ when we exhale.

• carbon monoxide

• carbon dioxide

• helium

• oxygen

The main organ of the respiratory system is the _______.

• lungs

• heart

• liver

• arteries and veins

Your lungs have tiny air sacs called _______.

• aorta

• arteries

• ventricles

• alveoli

Arteries carry blood with oxygen away from the heart.

• True

• False

When you breathe, your lungs take in ___ and remove ___.

• air, oxygen

• oxygen, carbon dioxide

• carbon dioxide, waste

• waste, air