Circulatory System Crossword

This printable crossword puzzle on the topic of Human Body Systems has 13 clues. Answers range from 5 to 14 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Thin walled chambers of the heart that receive blood from veins.
The process of blood clotting.
A complete heartbeat consisting of contraction and relaxation of both atria and both ventricles.
The thin, smooth inner lining of each chamber of the heart.
The outer layer of the heart wall; the visceral pericardium.
The phase in the cardiac cycle in which the heart relaxes between contractions; opposite of systole.
Middle layer of the heart wall and composed of cardiac muscle tissue.
Membrane that surrounds the heart; usually refers to the pericardial sac.
The phase in the cardiac cycle in which the ventricles contract, sending blood out of the heart and into the aorta and pulmonary aorta; opposite of diastole.
The natural ability of an organism to remain unaffected by, or to counteract, the effects of pathogens and other harmful agents in its environment.
Lack of resistance to disease.
One of the formed elements of the blood; functions in blood clotting; also called platelet.
White blood cell.