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CAIE A-Level Biology AS 8.2.1 Red Blood Cell Roles in O2 and Co2 Transport Questions

Explain red blood cell roles in oxygen and carbon dioxide transport using evidence from each question and mark scheme.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • Explain red blood cell roles in oxygen and carbon dioxide transport.

CAIE A-Level Biology AS 8.2.1 Red Blood Cell Roles in O2 and Co2 Transport Questions question 1

[Maximum number: 1]

Which reactions will be taking place in blood in a capillary that is next to an alveolus?

1Hb+4O2→HbO8 key 2H2O+CO2→H2CO3Hb= haemoglobin 3H2CO3→H++HCO3−\begin{array}{lll} 1 & \mathrm{Hb}+4 \mathrm{O}_{2} \rightarrow \mathrm{HbO}_{8} & \text { key } \\ 2 & \mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \rightarrow \mathrm{H}_{2} \mathrm{CO}_{3} & \mathrm{Hb}=\text { haemoglobin } \\ 3 & \mathrm{H}_{2} \mathrm{CO}_{3} \rightarrow \mathrm{H}^{+}+\mathrm{HCO}_{3}^{-} & \end{array}
A

1 and 2

B

1 only

C

2 and 3

D

2 only

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