We just learned about the Statocyst.
Another interesting thing about cephalopod bodies is the Octopus - Three Hearts.
An octopus has all th ree of it's hearts up in the head part of the body.
One of the hearts is called the systemic heart, and it pumps the blood all over their body, all the way to each arm and back.
The other two hearts are called branchial hearts, and they bring the deoxygenated blood back to the gills for more oxygen.
The blood in an octopus is thicker than a human, so it is harder for the octopus to pump through their body.
When they are swimming they do not use their systemic heart, so they get tired quickly and usually stop for a rest.
(from: wikipedia - octopus)
Kid Facts - Blast from the past: Frog Skin
