Circulatory System Crossword

This printable crossword puzzle has 10 clues. Answers range from 5 to 21 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Main organ of the circulatory system.
A flap of tissue that prevents blood from flowing backwards.
The liquid part of blood.
The body's disease fighters.
Blood vessels that carry blood back to the heart.
Blood vessels that carry blood away from the heart.
Lower chambers of the heart.
Upper chamber of the heart.
A group of heart cells that sends out signals that make the heart muscle contract.
Consists of the heart, blood vessels, and blood itself.