Page 2 - Circulatory System in Finfish
P. 2
Two type of circulatory system found in animal
Closed circulatory system Open circulatory system
Vertebrates, and a few The open circulatory system is
invertebrates, have a closed common to molluscs and arthropods.
circulatory system. Closed Open circulatory systems (evolved in
circulatory systems have the crustaceans, insects, mollusks &
blood closed at all times within other invertebrates) heart pump
vessels of different size and blood into a hemocoel with the blood
wall thickness. In this type of diffusing back to the circulatory
system, blood is pumped by a system between cells. Blood is
heart through vessels, and pumped by a heart into the body
does not normally fill body cavities, where tissues are
cavities. surrounded by the blood.
