red blood cells trapped by fibrin threads Fibrinogen is an insoluble protein made by the liver and floats around in the blood. It is converted to fibrin by thrombin, a clotting enzyme, at bleeding sites.
Octopuses swim by expelling a jet of water from a contractile mantle, and aiming it via a muscular siphon. Top 10 Examples of Awesomely Interesting Octopus Behavior! - Cool and Interesting Facts for Kids