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This tutorial will review the cardiac cycle - where blood goes during a heartbeat.

You can navigate through this tutorial using the buttons at the top of the screen.

The tutorial will ask you questions. Click on your chosen answer to see feedback; click the answer again to make the feedback disappear. When you're finished with one page, click the navigation button for the next page to move ahead.

Before you jump in, do the questions below to remind yourself about the path of blood flow. Choose the right answer from each sentence.

On each side of the heart, blood is collected in a chamber called an atrium / ventricle / vein.

The blood passes down into the muscular pumping chamber, the ventricle / atrium.

To keep the blood from going right back into the chamber it just left, these two chambers are separated by a one-way valve called a/an atrioventricular valve or AV valve / semilunar valve.

The blood moves out of the heart into the veins / arteries /

To keep blood from dripping back into the heart when it stops pumping, there's another one-way valve on each side. These are called ventriculoarterial valves / semilunar valves.

Now you're ready to go on and send the blood through the heart!