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CAIE IGCSE Biology 9.1.4 Advantages of a Double Circulation Questions

Practise tracing the pulmonary and systemic loops, then explaining why higher body pressure and lower lung pressure benefit mammalian circulation.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • Explain how separating oxygenated and deoxygenated blood supports efficient oxygen delivery to tissues.
  • Contrast high systemic and low pulmonary pressure for tissue flow, kidney filtration and safe lung gas exchange.
  • Link efficient oxygen/nutrient supply and waste removal to high respiration rates and larger body size.

CAIE IGCSE Biology 9.1.4 Advantages of a Double Circulation Questions 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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