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CAIE IGCSE Biology 9.1.4 Advantages of Double Circulation

Practise explaining how separate circuits deliver oxygenated blood to body tissues rapidly and at suitable pressure.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • explain that oxygenated and deoxygenated blood remain separate, maximising oxygen concentration to tissues
  • link a second pump through the heart to high-pressure, rapid systemic blood flow
  • relate faster oxygen and nutrient delivery to higher respiration rates and active mammalian tissues

9.1.4—Advantages of a double circulation question 1

[Maximum number: 3]

Fig. 6.1 shows diagrams of the circulatory systems of a fish and a mammal.
The arrows show the direction of blood flow through the circulatory systems.

Fig. 6.1

Fig. 6.1

Explain the advantages of the double circulation of the mammal.

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