3 concepts
The Role of the Circulatory System
The circulatory systems is a network of blood vessels supplying the body with oxygen and nutrients, while removing carbon dioxide and waste.
Open and Closed Circulatory Systems
The circulatory system can either be open or closed, depending on whether the blood flows freely in a cavity or is contained in vessels.
Types of Circulatory Systems in Animals
The circulatory systems of animals differ in the number of heart chambers and the number of circuits through which the blood flows.