| Your ____ filter blood plasma by separating it from waste. |
arteries |
| The smallest arteries are called ____. |
arterioles |
| The smallest veins are called ____. |
atriums |
| The ____ are the two thick-walled lower chambers of the heart. |
chambers |
| Blood travels from your heart to your legs through ____. |
kidneys |
| Blood travels from your legs to your heart through ____. |
veins |
| The ____ are the two upper chambers of the heart. |
ventricles |
| Your heart has four ____ (two atriums and two ventricles). |
venules |
