🫀 Part 1: Heart Structure & Blood

________________

🫁 Part 2: Respiratory System & Gas Exchange

Alveoli, Bronchi, Trachea, Bronchioles

📊 Part 3: ECG & Extension Activities

E_____________ C_____________ G_____________

🎯 Success Criteria

📝 Answer Key

1. Right atrium, Right ventricle, Left atrium, Left ventricle (4 marks)

2. Right ventricle (1 mark)

3. Arteries carry blood away from heart, have thick muscular walls, carry oxygenated blood (except pulmonary artery). Veins carry blood to heart, have thinner walls with valves, carry deoxygenated blood (except pulmonary vein). (3 marks)

4. Red blood cells (1 mark)

5. Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium (4 marks)

6. Trachea, Bronchi, Bronchioles, Alveoli (3 marks)

7. Diaphragm (1 mark)

8. Oxygen diffuses across alveolar membrane into capillaries due to concentration gradient, then binds to haemoglobin in red blood cells. (3 marks)

9. Breathing rate increases to supply more oxygen for increased cellular respiration in muscles. (2 marks)

10. Electrocardiogram (1 mark)

11. Electrical activity of the heart/heart rhythm (2 marks)

12. Cardiac output = Heart rate × Stroke volume = 70 × 70 = 4900ml/min or 4.9 litres/min (3 marks)