Part 1: Crossword Puzzle

part 1

An online crossword puzzle with 10 words. Play it free at AgileCrosswords.com.

Clues

_ allows hearts to pump blood to all parts of the body tissue except for the lungs.
The largest and most muscular chamber with the thickest walls in an avian heart.
The transfer of oxygen to the cells occur in the _
_ have tri-lobed gastrovascular cavity.
The body cavity of mullosc is named as _
Pulmonary circulation pumps blood to the _ only.
Hydra do not have a circulatory system but _ cavity.
A type of circulatory fluid.
Invertebrate with a closed circulatory system.
Vertebrate's heart with mixing of oxygenated and deoxygeneated blood.