CAIE IGCSE Biology 9.1.3 Mammalian Double Circulation
Practise tracing pulmonary and systemic circuits and showing that blood passes through the heart twice per complete journey.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- trace body → heart → lungs → heart → body in the correct sequence
- identify the pulmonary circuit between heart and lungs and the systemic circuit between heart and body
- cite two loops or two passages through the heart as evidence that a diagram shows double circulation
9.1.3—Double circulation of a mammal question 1
Fig. 1.1 is a simplified diagram of the circulatory system in humans.
Fig. 1.1
State the evidence from Fig. 1.1 that the diagram shows a double circulation system.
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