You can find all my A Level Biology videos fully indexed at [ Ссылка ]
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).
This video is aimed at the UK A Level Biology specifications. Students studying International A Level Biology will need to check their specification.
Image Credits:
Amoeba
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SmallRex, CC BY-SA 4.0 [ Ссылка ], via Wikimedia Commons
Cheetah
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Malene Thyssen, CC BY-SA 3.0 [ Ссылка ], via Wikimedia Commons
Blood
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Echinaceapallida, CC BY-SA 4.0 [ Ссылка ], via Wikimedia Commons
Cod
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Hans-Petter Fjeld, CC BY-SA 2.5 [ Ссылка ], via Wikimedia Commons
Termite
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Bernard DUPONT from FRANCE, CC BY-SA 2.0 [ Ссылка ], via Wikimedia Commons
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