Topic B3.2, transport, takes a look at the different circulatory systems and transport processes in animals and plants.

This episode looks into topic B3.1, gas exchange to understand the adaptations of gas exchange surfaces and the different processes surrounding gas exchange in animals and plants.

This episode takes a quick look at topic D2.3, water potential. We look into osmosis and its effects on cells as well as water potential and how it impacts the movement of water across a selectively permeable membrane.

Topic D2.2, gene expression, is an only HL topic that looks into epigenetics and gene expression as a whole. We take a look at different mechanism and examples to understand the relevance of gene expression and the impact of environmental factors on it.

This episode looks at topic D2.1, cell and nuclear division. We discuss the differences between mitosis and meiosis as well as the phases of the two different cell division types and their importance.

Topic C2.2, neural signalling, looks at the structure and function of neurons and at the process of neural signalling. We take a look at different examples, such as acetylcholine and cocaine, to understand how membrane potentials change to transmit nerve impulses.

In this episode we take a look at topic C2.1 which is chemical signalling. This is only in the HL syllabus and looks at ligands as signalling molecules and receptors are proteins that they bind to. We take a look at different example of ligands and receptors that initiate a variety of different signalling pathways.