Science Menu Crossword Puzzle

An organ system that carries nutrients and other chemicals to the cells of the body and carries away waste; includes the heart, arteries and veins.
An organ system that delivers oxygen to the blood and removes carbon dioxide, a waste gas, from the blood.
Something that obstructs (or blocks).
Wiped out.
A type of medicine that kills microbes or prevents them from growing.
Occurrence of more cases of a particular disease than expected in a given period of time or a given area.
A blood cell that protects the body from invading microbes.
The most common form of one-celled organisms.
A growth of germs in your body.
The study of how and why diseases occur.
Filters blood by removing harmful bacteria and viruses, activates B-cells, and destroys old red blood cells.
Soft tissue inside the bones that makes red blood cells and stores fat.
An organ that is important in the development of a type of white blood cell.
An indication in your body that you have a disease.
An epidemic that has spread throughout the world.