In which of the following types of circulatory systems does the transport of mixed blood occur?

The circulatory pattern,in which blood pumped by the heart passes through large vessels into open spaces or body cavities called sinuses,is called $.......$ and it is found in $........$

Cockroach and snails show circulation of blood through haemocoel. It is . . . . . . .

How is the hepatic portal system formed?

In an open circulatory system,where does the blood flow into the body?

Double circulation is