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CAIE IGCSE Biology 9.1.2 Single Circulation in Fish

Practise tracing blood from the fish heart through gills and body tissues before it returns to the heart.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • trace heart → gills → body tissues → heart as one complete fish circuit
  • explain that blood passes through the heart once during each full circulation
  • compare fish heart chambers and circulation pathways with double-circulation systems

9.1.2—Single circulation of a fish question 1

[Maximum number: 1]

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

Fig. 6.1 shows that fish and mammals have different types of circulation.

State why the fish circulation is called a single circulation.

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