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CAIE IGCSE Biology 9.2.9 Septum & Blood Separation

Practise explaining how the heart septum prevents mixing of oxygenated and deoxygenated blood.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify the septum as the muscular partition separating the left and right sides of the heart
  • explain that separation preserves a high oxygen concentration in blood pumped to body tissues
  • predict that a septal hole allows mixing and reduces oxygen delivery for respiration, growth or activity

9.2.9—Importance of the septum in separating question 1

[Maximum number: 3]

Fig. 2.1 shows a cross-section of a human heart.

Fig. 2.1

Fig. 2.1

Fig. 2.2 shows a cross-section of part of a heart that has an incomplete structure.

Fig. 2.2

Fig. 2.2

Explain how the incomplete heart structure shown in Fig. 2.2 may affect a person's ability to transport oxygen.

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