Respiratory and Circulatory System

What is the main organ of our circulatory system?

• heart

• lungs

• skin

• liver

The heart is about the size of your ________.

• foot

• brain

• ear

• fist

How many chambers does the heart have?

• 1

• 2

• 3

• 4

What makes the heartbeat sound we hear?

• ventricles squeezing blood.

• circulating blood

• valves opening and closing

• heart muscle contracting

What do we call the movement of

blood through the heart and around the body?

• circulation

• transportation

• digestion

• breathing

Tags

NGSS.MS-LS1-3

What do we call the tiny tubes that carry blood away from the heart?

• valves

• arteries

• atria

• bones

What do we call the tiny tubes that return oxygen

poor blood back to the heart?

• arteries

• chambers

• veins

• ventricles

When we breathe in, our bodies use _________ to live.

• carbon monoxide

• carbon dioxide

• nitrogen

• oxygen

We breathe out ________ when we exhale.

• carbon monoxide

• carbon dioxide

• helium

• oxygen

Tags

NGSS.MS-LS2-3

The main organ of the respiratory system is the _______.

• lungs

• heart

• liver

• arteries and veins