How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
7th grade science circulatory system
the body system that consists of the heart, blood vessels, and blood, and that carries needed substances to cells and carries waste products away from cells
the hollow muscular organ located behind the sternum and between the lungs
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
a specialized bit of heart tissue that controls the heartbeat
a blood vessel that carries blood from the heart to the body
a blood vessel that carries blood from the capillaries toward the heart
a tiny blood vessel where substances are exchanged between the blood and the body cells
The largest artery in the body; it conducts freshly oxygenated blood from the heart to the tissues.
push or pull exerted on an object