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Edexcel SNAB A Level Biology Topic 1 Specific Summary Notes

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Edexcel SNAB (Salters-Nuffield Biology A) A Level Biology Topic 1: Lifestyle, Health and Risk. Completed Cornell Notes that are spec-point specific. Contains concise notes that are mark scheme specific and high yield content. Perfect for cramming before an exam or to identify the key information in the specification.

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Topic/spec points:

1.1 Understand why many animals have a heart and circulation (mass transport to overcome
limitations of diffusion in meeting the requirements of organisms).


Questions/Keywords/ Notes / diagrams:
definitions:




Describe and compare open,
single and double circulation
systems.

Relate surface area to
volume ratio to the size of an
organism

Explain how as this ratio
decreases, the method of
exchanging waste/nutrients
with the environment must
change.




Summary:

,Topic/spec points:

1.2 Understand the importance of water as a solvent in transport including its dipole nature.

Questions/Keywords/ Notes / diagrams:
definitions:




Draw two water molecules,
showing their dipolar nature
and the formation of
hydrogen bonds between
them.



Explain the importance of
the following properties of
water; universal solvent, high
heat capacity, adhesion,
cohesion.




Summary:

, Topic/spec points:

1.3 Understand how the structures of blood vessels (capillaries, arteries and veins) relate to their
functions.


Questions/Keywords/ Notes / diagrams:
definitions:




Describe the structure of
arteries, veins and
capillaries.

Relate the structures
(collagen, elastic fibres,
muscle, endothelium) to
their function.

Calculate the area of a blood
vessel using πr2.




Summary:

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