Circulatory system: The circulatory system is a system that uses blood to move things throughout our bodies. There are around 5.5 litres of blood in an adult human body, which serves as the body's transportation system. Blood circulates throughout the body, ensuring that it reaches all of the body's cells.
The human circulatory system consists of the heart, blood vessels, and blood.
Heart: It is a muscular organ, pear-shaped, located in the chest cavity slightly towards the left.
Blood vessel: The pipe-like structure to transmits blood from one part to another.
Blood: Blood is a red-coloured fluid flowing inside blood vessels.
