Circulatory systems Crossword

This printable crossword puzzle on the topic of Human Body Systems has 15 clues. Answers range from 4 to 15 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

The type of circulatory system commonly seen in invertebrates.
The name of the valve separating the left atrium & the left ventricle.
Type of circulatory system seen in birds & mammals.
Name of the artery leaving the left side of the heart.
Name of the vein entering the right side of the heart.
Type of blood vessel that carries blood away from the heart.
Type of blood vessel that has valves to prevent backflow of blood.
Type of cells that line the lumen of each blood vessel.
Name of the muscle tissue found in the heart.
Valves that prevent backflow of blood into the ventricles.
Name of the artery leaving the right side of the heart.
name of the vein entering the left side of the heart.
Blood containing high levels of oxygen is known as...
Name of the nerve fibres that stimulate contraction of the ventricles.
Name of the bundle of nervous tissue that initiates the cardiac cycle.