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(g) Gas exchange

Syllabus
2024
Topic
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Level
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2.40B Diffusion in gas exchange

Understand the role of diffusion in gas exchange.

2.41B Gas exchange in respiration and photosynthesis

Understand gas exchange (of carbon dioxide and oxygen) in relation to respiration and photosynthesis.

2.42B Leaf adaptations for gas exchange

Understand how the structure of the leaf is adapted for gas exchange.

2.43B Stomata in gas exchange

Describe the role of stomata in gas exchange.

2.44B Light intensity and net gas exchange

Understand how respiration continues during the day and night, but that the net exchange of carbon dioxide and oxygen depends on the intensity of light.

2.45B Light and leaf gas exchange practical

Practical: investigate the effect of light on net gas exchange from a leaf, using hydrogen-carbonate indicator.

2.46 Thorax structure

Describe the structure of the thorax, including the ribs, intercostal muscles, diaphragm, trachea, bronchi, bronchioles, alveoli and pleural membranes.

2.47 Ventilation muscles

Understand the role of the intercostal muscles and the diaphragm in ventilation.

2.48 Alveoli adaptations

Explain how alveoli are adapted for gas exchange by diffusion between air in the lungs and blood in capillaries.

2.49 Biological consequences of smoking

Understand the biological consequences of smoking in relation to the lungs and the circulatory system, including coronary heart disease.

2.50 Ventilation practical

Practical: investigate breathing in humans, including the release of carbon dioxide and the effect of exercise.

Objective notes

11 learning objectives
240B Diffusion in gas exchangeUnderstand the role of diffusion in gas exchange.View241B Gas exchange in respiration and photosynthesisUnderstand gas exchange (of carbon dioxide and oxygen) in relation to respiration and photosynthesis.View242B Leaf adaptations for gas exchangeUnderstand how the structure of the leaf is adapted for gas exchange.View243B Stomata in gas exchangeDescribe the role of stomata in gas exchange.View244B Light intensity and net gas exchangeUnderstand how respiration continues during the day and night, but that the net exchange of carbon dioxide and oxygen depends on the intensity of light.View245B Light and leaf gas exchange practicalPractical: investigate the effect of light on net gas exchange from a leaf, using hydrogen-carbonate indicator.View
ConceptIGCSE Biology