Closed circulatory system, but fluid constituents of blood leak out of capillaries and return to the heart by the second component of the circulatory system, the lymphatic system. Considerable ...

As organisms with complex systems, there's a ton of messages that need to be passed between organs as well as an immune system that needs to respond to threats anywhere in the body. On top of this ...

3. Circulatory and respiratory systems - 2 weeks to do circulatory system - This week, do heart, blood vessels above the heart, respiratory system - Table 1 - heart to subclavian arteries - Table 2 ...

In the 1966 novel Fantastic Journey, by Isaac Asimov, a miniature submarine and crew travel throughout the human circulatory ...

Learn about the circulatory system with these interactive learning resources for KS2 Science students aged 7-11 from BBC Bitesize.