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What's the advantage of having a double circulation system, where the blood travels to the heart twice?

The heart is an ___ made from mainly ___

What's the job of the heart?

The heart has got _ chambers

On the left, you have the left ___ (top), and left ___(bottom) (remember abc to recall which is at the top/bottom)

The atria (plural for atrium) are separated by __

What do the valves do?

(this is not a question) Key point to remember: *turn card*

Th vena cava is where...

It then enters the right ___ when the heart c___