GCSE Biology - Stomata

In this episode, we will discuss the alveoli in the circulatory system.Alveoli are microscopic air sacs within the lungs where the crucial exchange of oxygen and carbon dioxide occurs between air and blood through diffusion. Their structure is highly adapted for this vital proces ...  Show more

In this episode, we look at transportation in cells. We will explain how substances move into and out of cells, highlighting three key mechanisms. Diffusion is described as the movement of particles from high to low concentration areas. Osmosis is presented as a specific type of ...  Show more

This episode reviews the topic of cells, including: The levels of organisation in multicellular organisms. The differences between animal and plant cells and the process of cell differentiation and the uses of stem cells. This episode is suitable for all examination boards but mo ...  Show more

This episode reviews the topic of plant transport, including: Water absorption in the roots, Transpiration and Translocation. This episode is suitable for all examination boards but more specifically geared to IGCSE Edexcel. 

This week, Emma's got the lowdown on facilitated diffusion and polarized membranes for your AP Bio exam. She looks at how molecules diffuse through carrier proteins or channel proteins in membranes. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A ...  Show more

This episode reviews the topic investigating biological molecules, including: How to test for the presence of reducing sugars, non-reducing sugars, starch, proteins and lipids. This episode is suitable for all examination boards but more specifically geared to AQA A-Level Biology ...  Show more