Compare closed and opened circulatory system.

Explanation

Animals posses two types of circulatory system . They are
(I ) open type
(ii ) closed type
(I ) open type :
In open type the blood is pumped by heart into blood vessels tha open into blood spaces called as sinuses . These sinuses are the body cavities which are called .
haemonceol. Capillary system in absent E .g : Arthropods ,molluscs and Ascidians .
(ii ) Closed type
In closed type the blood flows in a complete circult around the body flows from arteries to veins through small blood vessles called
Capillaries . Eg Verebrates .