An interactive Year 7 Biology lesson exploring how specialised cells are adapted to carry out particular jobs. Students investigate nerve cells, red blood cells, sperm and egg cells, palisade cells and root hair cells using animated models, selectable features and guided activities. Visualisations include repeated electrical impulses travelling along a nerve cell, oxygen binding to haemoglobin and being transported from the lungs to body tissues, a scaled sperm–egg comparison, photosynthesis in palisade cells and absorption by root hair cells. simopsis