Exchange of Materials,

Circulatory system

• Consists of a group of organs which assist the movement of substances around the body such as glucose and oxygen.
• Humans and other complex organisms have a closed circulatory system which blood is contained within a series of vessels.
• This allows; speed, pressure and distribution of blood to be controlled.

Single Circulatory System,

• In a single circulatory system, the blood flows through a two-chambered heart, just once every time the blood flows in…