A - Unity and Diversity
B - Form and Function
B1.1 Carbohydrates and lipids
B1.2 Proteins
B2.1 Membranes and membrane transport
B2.2 Organelles and compartmentalization
B2.3 Cell specialization
B3.1 Gas exchange
B3.2 Transport
B3.3 Muscle and motility (HL)
B4.1 Adaptation to environment
B4.2 Ecological niches
C - Interaction and Interdependence
D - Continuity and Change
View a summary cheatsheet for B3.1 Gas exchange
B3.1.1 Gas exchange as a vital function in all organisms
B3.1.2 Properties of gas-exchange surfaces
B3.1.3 Maintenance of concentration gradients at exchange surfaces in animals
B3.1.4 Adaptations of mammalian lungs for gas exchange
B3.1.5 Ventilation of the lungs
B3.1.6 Measurement of lung volumes
B3.1.7 Adaptations for gas exchange in leaves
B3.1.8 Distribution of tissues in a leaf
B3.1.9 Transpiration as a consequence of gas exchange in a leaf
B3.1.10 Stomatal density
B3.1.11 Adaptations of foetal and adult haemoglobin for the transport of oxygen (HL)
B3.1.12 Bohr shift (HL)
B3.1.13 Oxygen dissociation curves (HL)
