Pearson Edexcel GCE
In Biology A Salters Nuffield (9BN0)
Paper 2: Energy, Exercise and Coordination
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2022 xcel B
Edexcel and BTEC Qualifications
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2022 xcel B
Ede
Question
Answer Additional Guidance Mark
Number
1(a)(i) A description that makes reference to two of the
following:
• the valves are open { when atria contract / atrial ALLOW valves open to allow blood to flow from atria to
systole / when blood pressure greater in atria ventricles
(than ventricles) } (1)
• the valves close { when ventricles contract /
during ventricular systole/when pressure greater
in ventricles (than atria) } (1)
• valves prevent backflow of blood into the atria ALLOW tendons prevent valves from inverting during
during ventricular systole (1) ventricular systole (2)
Question
Answer Additional Guidance Mark
Number
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