Heart Structure and Function

IGCSE Edexcel Biology
2.65 Heart Structure and Function
Key Concept: The heart is a muscular pump with valves to maintain one-way blood flow.

Section A: Labeling

1. Label the heart with: left atrium, right atrium, left ventricle, right ventricle, aorta, pulmonary artery, pulmonary vein, vena cava. [8]
[Heart diagram]

Section B: Function

2. Explain the role of valves in the heart. [2]
3. Explain what is meant by double circulation. [3]
Total marks: 13

Mark Scheme

1. All eight labels correct [8]
2. Valves prevent backflow and keep blood moving in one direction [2]
3. Blood passes through the heart twice per circuit: pulmonary and systemic circulation [3]