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

The heart is about the size of your ________.

How many chambers does the heart have?

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 ________.

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