The circulatory system consists of three ... then returns deoxygenated blood back to the heart. The system of blood vessels in the human body measure about 60,000 miles (96,560 kilometers).

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 ...

Your circulatory system works all day, every day, to pump oxygen throughout your body. There are cardiovascular conditions that can impact this system. Your circulatory system, also known as your ...

PRESENTER:'Ella has P.E. today, and her circulatory system is going to have some exceptional ... The average resting heart rate for a human is around 80 beats per minute, but everyone is different ...