ACTIVITY SHEET - The Circulatory System

Names:

_____________________________
_____________________________
_____________________________


The Circulatory System is made up of the 1.)_________________ , blood, and blood vessels. . Blood vessels are elastic, tube-like veins, 2.)_______________ and capillaries.
The circulatory system has the job of moving 3.)______________ through the entire body. Blood is made up of 4.) ____________________ , white cells, red cells, and 5.)________________ . White cells fight 6.)________________, red cells carry 7.)________________, and 8.)__________________ cause the blood to clot.

Your heart is the size of a 9.)________________ . Arteries branch out into smaller and smaller blood vessels. The smallest are called 10.)__________________. In the capillaries, the blood releases oxygen and nutrients to the cells which turn them into energy. The “used” blood brings waste products back to the 11.)______________ side of the heart. Then it is sent to your lungs for fresh
12)._______________ and flows to the left side to start all over again. Red blood carries 13.) _________________. The largest artery in the body is called the 14.)____________________. The largest vein is the 15.) _____________________ .