Bioniac

In this post we are going to discuss about Circulation of Body Fluids. For the post about Body Fluids, click  here . Circulatory   Pathway : The circulatory patterns are of two types – open or closed.  •Open circulatory system is present in arthropods and molluscs in which blood pumped by the heart passes through large vessels into open spaces or body cavities called sinuses.  •Annelids and chordates have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels.  •Closed circulatory pattern is considered to be more advantageous as the flow of fluid can be more precisely regulated. •All vertebrates possess a muscular chambered heart. Fishes have a 2-chambered heart with an atrium and a ventricle.  •Amphibians and the reptiles (except crocodiles) have a 3-chambered heart with two atria and a single ventricle, whereas crocodiles, birds and mammals possess a 4-chambered heart with two atri...