Squid & CrocodileCirculatory System

Azneezal Ar-Rashid

Smk Sri Aman

• The squid has a relatively complex circulatory system for invertebrates, with a closed circulatory system.

• The squid has two branchial hearts at the base of the gills which send unoxygenated blood through the gills.

• The third ventricular heart then pumps this oxygenated blood throughout the body.

crocodile: circulatory system

• In crocodiles the ventricular septum is complete, but the two aortas come out of different ventricular chambers.

• A semilunar valve at the entrance to the left aorta prevents nonaerated blood in the right ventricle from flowing into the aorta.

• Instead, part of the aerated blood from the left ventricular chamber pumped into the right aorta flows into the left by way of an opening.