A-Level Biology OCR A
Blood Closed Circulatory Vessels Heart Describe Features Systems
| Front |
Describe the features of closed circulatory systems and what organisms have them. |
| Back |
Closed circulatory system features:- Blood is enclosed in vessels and does not come into contat with cells of the body
- Heart pumps the blood at high pressure through arteries and blood quickly returns back to the heart through veins after the exchange at capillaries in tissues
- Amount of blood flowing can be adjusted by widening/narrowing blood vessels
- Most able to carry gases using haemoglobin
- Found in echinoderms (sea urchins and starfish), cephalopod molluscs (octopods and squid), earthworms and all vertebrates
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A-Level Biology OCR A