Sinus venosus is associated with. 

The substance produced in one part of the body and taken to another part. 

In insects, the colour of the blood is 

In cockroach, the muscles that help in sending the blood into heart.

What is the colour of blood in snail ?

Sinus venosus is absent in. 

Endocrine gland on the kidney. 

Deoxygenated system in cockroach is.

Open type of circulatory system consists of. 

Caval veins in amphibians from.