Well, the blood has to be kept moving around all the time because it's the body's delivery system. Every possible part of the body has to be supplied with oxygen and food and water, and the veins and ...

Students in Angela Collins’ anatomy class at St. Joseph High School recently completed an extensive project of mapping the human circulatory system. The class was divided into groups which were ...

The heart is a unidirectional pump. Valves are present to prevent the backflow of blood. This unidirectional flow of blood through the heart shows that mammals have a double circulatory system. This ...