Circulation of Body Fluids - 1

In hydra, water enters and is expelled through the mouth as there is no anus

The heart of a cockroach is elongated, thick, muscular, tubular and 13-chambered.

Paramecium is a unicellular organism and shows streaming movement called cyclosis. It helps in intracellular circulation and distribution of materials in the cells.

In hydra, internal circulatory fluid is absent. Thus, it uses external medium (water) as circulatory fluid.

Flatworms transport digested food through parenchyma. They exhibit parenchymal circulation.

Food transport takes place with the help of pseudocoelomic fluid.

Osculum is the large aperture in a (sycon) sponge through which water is expelled.

Gaseous exchange is a function of respiratory system. It happens by the phenomenon of breathing.

Sycon, a porifer, has water as a circulatory fluid.

In sponges like Scypha, there is an elaborate system of canals through which water flows in a definite course and perform the functions of circulatory system.

Hydra has distinct testes and ovary for reproduction.

In open blood vascular system, the blood vessels do not divide into capillaries and open in a wide space called sinuses in the body cavity. The blood fills the cavity and bathes the organs.

The fish heart is known as branchial or venous heart because it only receives the venous blood and pumps it directly to the gills for oxygenation.