Author: Freesciencelessons via YouTube
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In this video, we look at single and double circulatory systems. First, we look at single circulatory systems such as that found in fish. We then explore the double circulatory system for example the one found in humans. Finally, for OCR students, we look at what is meant by a closed circulatory system (eg in humans and fish) and an open circulatory system (eg in insects).

Image Credits:

Amoeba
https://commons.wikimedia.org/wiki/File:Amoeba_proteus_another_form.jpg
SmallRex, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Cheetah
https://commons.wikimedia.org/wiki/File:Gepardjagt2_(Acinonyx_jubatus).jpg
Malene Thyssen, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Blood
https://commons.wikimedia.org/wiki/File:Blood1.jpg
Echinaceapallida, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Cod
https://commons.wikimedia.org/wiki/File:Gadus_morhua-Cod-2-Atlanterhavsparken-Norway.JPG
Hans-Petter Fjeld, CC BY-SA 2.5 https://creativecommons.org/licenses/by-sa/2.5, via Wikimedia Commons

Termite
https://commons.wikimedia.org/wiki/File:Northern_Harvester_Termite_(Hodotermes_mossambicus)_(6856939924).jpg
Bernard DUPONT from FRANCE, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons

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