Circulatory System

-Mollusk- Most have a open circulatory system. Cephalopods have a closed circulatory system. Within a open circulatory system blood is not restricted to just flowing in blood vessels. Blood within a open circulation is pumped into blood cavities by a heart and is brought back through arteries.

-Amphibian- Amphibians have a double loop, 3 chambered heart. The first loop takes oxygen-poor blood to the lungs to put oxygen in it. The second loop transports the oxygen-rich blood through the body and back to the heart.

-Annelids- Annelids have closed circulatory systems. The blood is confined into blood vessel and is recirculated for maximum use. Earthworms have neither lungs nor gills but it's uses its surface area to get oxygen from the earth. The dorsal blood vessels take the oxygen and transport it back to the heart.

Human- the circulatory system uses blood to transport, nutrients, oxygen, amino acids, electrolytes, etc. throughout the body to maintain homeostasis, Ph balance, temperature, etc. Blood is a fluid that is made of platelets and is transported though the body by the heart.

Arthropods- their hearts contain 7 arteries. The anterior arose from the anterior of the dorsal surface of the heart and gives rise to the optic arteries. These arteries supply hemolymph to the supreasophageal ganglion and eyestock. Arthropods have an open circulatory system.

Echinoderms- Echinoderms are coelomates and they contain a true body cavity. This cavity acts as both a circulatory and respiratory system. Respiratory gases move freely through the coelem. The water vascular also acts as a circulatory system.

Reptiles- closed circulatory system, similar to humans. Reptiles have a double circulatory system, but the heart is not always completely separated into 2 separate pumps.