Gas Exchange Function of Living Organisms

Worked examples (6)

• 1Name a labelled part of the thorax (Getting started)
• 2Order of the airways (Getting started)
• 3Why the diaphragm is described as a muscle (Building confidence)
• 4Function of the pleural membranes (Building confidence)
• 5Alveoli and surface area (Stretch)
• 6Complete a full thorax diagram (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the structures used to breathe (Getting started)
• 2What happens to the diaphragm when you breathe in (Getting started)
• 3Describe inhalation step by step (Building confidence)
• 4Describe exhalation step by step (Building confidence)
• 5Compare inhalation and exhalation (Stretch)
• 6Why two sets of muscles are needed (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the gases exchanged in the alveoli (Getting started)
• 2Match an adaptation to its job (Getting started)
• 3Why so many alveoli? (Building confidence)
• 4Why blood keeps flowing past (Building confidence)
• 5Describe all the adaptations (Stretch)
• 6Apply the ideas to data (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended application

Worked examples (6)

• 1Name a chemical in tobacco smoke and its effect (Getting started)
• 2Why smokers get a 'smoker's cough' (Getting started)
• 3How carbon monoxide reduces oxygen transport (Building confidence)
• 4Explain breathlessness in emphysema (Building confidence)
• 5Two separate effects of tar on the lungs (Stretch)
• 6Sort smoking effects: lungs vs circulation (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the test for carbon dioxide (Getting started)
• 2Which air has more CO₂? (Getting started)
• 3Design the exercise investigation (Building confidence)
• 4Explain why breathing rate increases (Building confidence)
• 5Interpret breathing-rate data (Stretch)
• 6Improve the limewater investigation (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response