Types of Circulatory System

The necessity of a transport system in a complex multicellular organism

Transport oxygen and nutrients to body cells and transport waste substances from the body cells

Types of circulatory systems in multicellular organisms

Open circulatory system and closed circulatory system

Open circulatory system

The heart pumps haemolymph directly into the body cavity and bathes the cells

Closed circulatory system

The heart pumps blood in a closed blood vessels and is distributed to the whole body

Circulatory system of insects

Open, the heart pumps hemolymph through vessels into body cavities. The heart is made up of many segments of space

Circulatory system of fish

Closed, single where the blood goes through the heart once in a one complete circulation. The heart has one atrium and one ventricle

Circulatory system of amphibians

Closed, double, blood flows through the heart twice in one complete circulation, the heart has two atria and one ventricle

Circulatory system of humans

Closed, double where blood flows through the heart twice in one complete circulation. The heart has two atria and two ventricles

Complete circulatory system

There is no mixing of oxygenated blood and deoxygenated blood in the ventricles. For example, circulatory system of humans

Incomplete circulatory system

Oxygenated blood mixes slightly with deoxygenated blood in the ventricles. For example, the circulatory system of amphibians