In what part of the body are red blood cells made?

How many chambers does the heart have?

What makes the heartbeat sound we hear?

What do we call the movement of

blood through the heart and around the body?

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

What do we call the tiny tubes that return oxygen

poor blood back to the heart?

What do we call the smallest blood vessels in our bodies?

The yellowish fluid that is in the blood that contains nutrients is called __________.

The part of the blood that helps you stop bleeding when you cut yourself is called __________.

The part of the blood that carries oxygen is called ________.

The part of the blood that fights off harmful bacteria and viruses is called ________.

The large artery that brings blood from the heart to the lungs is called the ___________.

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

We breathe out ________ when we exhale.

The main organ of the respiratory system is the _______.

Your lungs have tiny air sacs called _______.