There’s also a group of scientists that have been working on how to artificially produce blood in a lab, you can read more about that here: https://www.bbc.co.uk/news/health-39354627
The heart is the muscle at the centre of our circulatory system, and its main job is pump blood containing oxygen and nutrients around the body, as well as get rid of any waste products! The BHF have some useful information on how the heart works: https://www.bhf.org.uk/informationsupport/how-a-healthy-heart-works
I ran 10KM for the BHF in 2017 as they do vital research into heart disease which unfortunately has affected someone in family.
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