Humans have a closed circulatory system, in which blood is pumped by the heart through dedicated vessels, where it stays contained, as opposed to an open circulatory system (usually found in invertebrates) where blood is pumped out of the heart and vessels.
closed circulatory system.
closed
mammals have closed circulatory system and further double circulatory system.
Tigers are mammals and so their circulatory system is very similar to that of humans.
a closed one
closed. Open circulatory systems are common in athropods, such as scorpions and insects, but not of mammals. They are when the body lacks blood vessels but has blood throughout the entire cavity of the body. Mammals have closed circulatory systems, as they contain blood vessels.
Their circulartion system is very similar to humans (closed circulatory system)
Amphibians have closed circulatory system Closed
A humans circulatory system is closed. Large creatures tend to have a closed system, while smaller creatures like insects and crustaceans have open circulatory systems. Closed is when there are vessels and the blood stays there. Open is when blood floats around the body. Hope it helps:)
closed circulatory system (double circulatory system)
i believe it was william harvey
they have a closed circulatory sytsem:]yur welcome..... Sorry, this answer is very incorrect. A closed circulatory system means that the blood is contained within blood vessels, which the heart is able to pump/move through the tissues for very efficient gas exchange. Sponges DO NOT have this. In fact sponges do not even technically have a circulatory system at all, gas exchange is achieved by diffusion from the outer cells. So this means that sponges do not have an open or a closed circulatory system, because they don't have one at all.
Some dont have any at all but most have closed cirrculatory systems.