The job of the heart is to...

What is the main organ of the circulatory system?

Deoxygenated blood means that the blood is low in...

As the blood reaches the lungs, what is removed from the blood?

The part of the blood that carries oxygen is called

What type of blood vessels normally carry de-oxygenated blood back to the heart from body cells?

What type of blood vessel normally carries oxygenated blood from the heart to the body cells?

What type of blood vessel is the site of gas exchange where the exchange of gases, nutrients, and wastes occurs?

The heart is about the size and shape of your ___.

Which are the smallest blood vessels?

Which are the largest blood vessels?

White blood cells ____.

_______ is the liquid part of the blood.

_______ help to form clots and stop bleeding.

Which system makes red blood cells?

Which system breaks down food into nutrients?

Which system sends electrical signals to the heart to tell it to beat?

How many types of blood vessels are in our bodies?

How many components are in our blood?

One of the most common examples of homeostasis is body temperature. When your body temperature rises above normal, how does your body respond?

How does your body respond when your body temperature drops below normal?

There were many systems involved in helping the body keeps its normal body temperature. Check all that apply.

The maintenance of an organism’s internal environment is called:

Why does pulse rate increase during exercise?

True or false: Blood that is low in oxygen is blue