Veins between two capillary networks are portal systems. Closed circulatory system, but fluid constituents of blood leak out of capillaries and return to the heart by the second component of the ...

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 ...

Human circulation. video Human circulation This short film takes us on a journey around the circulatory system using the example of a baby's first breath. Human circulatory and digestive system.