Hormones: Contraceptives 💊 - GCSE Biology Le...

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 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

Richard looks at different bond types for your GCSE Chemistry exam. In this episode, he will look at the different types of chemical bonds that exist. Suitable for AQA, OCR, Edexcel, CIE and WJEC exam boards. Ideal for preparing your GCSE Chemis ...

Richard looks at displacement reactions for your GCSE Chemistry exam. In this episode, he will look at when and why displacement reactions occur. Suitable for AQA, OCR, Edexcel, CIE and WJEC exam boards. Ideal for preparing your GCSE Chemistry</ ...

Richard looks at ionic bonds for your GCSE Chemistry exam. In this episode, he will look at what ionic bonds are and their key properties. Suitable for AQA, OCR, Edexcel, CIE and WJEC exam boards. Ideal for preparing your <a href="http://bit.ly/2to1AEy" rel="ugc noopener noref ...