The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body.

The cardiovascular system, the human body’s circulatory system, is a vital network of organs and tissues such as the blood, heart, and blood vessels responsible for transporting blood. The circulatory ...

Each 2.54 square centimetre (a square inch) of human skin has six metres (20ft) of blood vessels. Veins hold about 65 per cent of the body's blood and have one-way valves tohelp blood move.

Find out about the different stages of a human life cycle and how ... Find out how the circulatory system takes oxygen around the body. What is in your blood? Discover how blood vessels and ...

The changes in metabolic activity associated with endothermy and the change from gill to lung respiration has led to changes in vertebrate circulatory ... highly efficient system, but has some ability ...

This short film offers a look at respiration and a tour around the circulatory system and digestive system in the human body, through blood vessels and into mitochondria. There is a detailed ...