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Summary notes - Unit 3 - Organisms exchange substances with their environment £2.99   Add to cart
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Summary notes - Unit 3 - Organisms exchange substances with their environment

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This is an overview of mass transport in animals including all the information you need to know along with some exam questions that are ideal to learn. This is content required to learn in 3.3.4.1 of the AQA specification.

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  • November 5, 2024
  • 10
  • 2024/2025
  • Summary

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, Heart Recap
.
1. Double pump - has Deoxygenated and oxygenated blood. The blood
through the heart twice.
RHS - pumps deoxygenated blood to the wings to pick up oxygen. Tr
distance at a lower pressure travels back to the LHS.
LHS - Pumps oxygenated blood around the body at high pressure - s
circuit it also repressurised the blood this allows for every respiring
2.Valves maintain the direction of blood and prevent backflow.


Right Left.
Right a.v (tricuspid). Left a.v (bi
Pulmonary valve Aortic va



3. A.v valves open when the pressure in the atrium is greater than
ventricle. A.v valves close when pressure in the ventricles is higher
than in the Atrium.
Semi - lunar valves open when pressure in the ventricle is higher th

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