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The epithelial cells in the lungs are arranged into structures called alveoli which are found at the end of bronchioles and are adapted for efficient gas exchange. Firstly, there are millions of alveoli with...

Everyone revises differently, but I believe that the most efficient revision methods are active, rather than just reading notes. If you are a visual learner, my top tip would be making posters to put up arou...

For cells in the body that replicate, they undergo mitosis to produce two identical daughter cells from one parent cell. These cells are undergoing a cycle, called the cell cycle, with several stages leading...

Both aerobic and anaerobic respiration have glycolysis as their first steps. Glycolysis occurs in the cytoplasm and involves phosphorylation of glucose to glucose-6-phosphate, forming ATP and reduced NAD. Py...

Type of receptor and stimulus e.g. eye receptors and light. Information is passed from the receptor to the effector by neurones: sensory, relay and motor. The receptor converts the stimulus into electrical i...