1
the system that transports blood throughout the body
2
a cell that defends the body against diseases
3
a cell that delivers oxygen to body cells
4
the body system that helps defend against disease
5
the proteins made by white blood cells that help destroy bacteria and viruses
6
a tiny blood vessel that connects arteries to veins
7
one of the two lower chambers
8
a cell fragment that helps clot the blood
9
a blood vessel that carries oxygen-rich blood away from the heart
10
one of the two upper chambers
11
the liquid portion of the blood
12
a blood vessel that carries oxygen-poor blood back to the heart
