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.

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.

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

What are the parts of a human body ... the digestive system for Scotland's Curriculum for Excellence (CfE). What does the heart do? Learn how the heart pumps blood round the circulatory system ...

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 ...

Ochsner Health and STEM NOLA are joining forces for an educational event focused on the heart and circulatory system, ...