What is in our blood? Crossword

This printable crossword puzzle on the topic of Human Body Systems has 12 clues. Answers range from 5 to 15 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

These carry blood from the heart to the body
These carry blood from the body to the heart
The substance in the cells which carry oxygen
The gas that is carried in our blood
The yellow liquid in our blood
These fight infection
We absorb oxygen here
oxygen gives this to our cells
if we exercise, our heart beats ...
The cells in our blood which form blood clots
These stop the blood moving in the wrong direction
The heart has four ...