Blood goes from your lower body back to your heart through ___.

Which of these might occur if coronary circulation is blocked?

Which of these is true?

What are the upper chambers of the heart called?

What prevents blood from flowing backward in the veins?

Which of these fights invaders of your body?

___ carry blood away from the heart.

One way to get nutrients into cells is ___.

Which of these is caused when blood pressure is higher than normal?

The measure of the force of your blood that occurs when blood is pushed out of the heart is the ___.

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