Select all organs that are mainly in the circulatory system

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

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

The heart is about the size of your ________.

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 part of the blood that carries oxygen is called ________.

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

We breathe out ________ when we exhale.

The main organ of the respiratory system is the _______.

Your lungs have tiny air sacs called _______.

The diaphragm, trachea, and alveoli are part of the ________________ system.

Arteries carry (almost always) oxygenated blood

If you are sick, which part of your blood would there be more of?

How many chambers does the human heart have?

What happens in the lungs?