A-level Biology
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3.3 Exchange and transport
Paper 1 and Paper 3.
7 Lessons
Level 1
Size, surface area and exchange
Size, surface area and diffusion
Core
Level 2
Gas exchange in insects, fish, leaves and lungs
Gas exchange in insects, fish, leaves and lungs
Core
Level 3
Digestion and absorption
Digestion and absorption in two stages
Core
Level 4
Haemoglobin and oxygen dissociation
Reading oxygen dissociation curves
Core
Level 5
The heart, blood vessels and tissue fluid
The cardiac cycle and cardiac output
Core
Required practical 5: dissecting a mammalian heart
Core
Level 6
Transport in plants
Mass transport in plants
Core