IGCSE›Edexcel IGCSE Biology›Mind mapsLevels of OrganisationEdexcel IGCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsThe orderOrganelles are the smallest levelThen cells → tissues → organsSystems are the largest levelEach level is built from the one belowOrganelles & cellsOrganelle: structure in a cell with one jobCell: smallest unit that carries out all life processesCell is built from many organelles working togetherOrganisationfrom organelles to systemsTissuesGroup of similar cells with a shared functionMuscle tissue contracts to cause movementEpithelial tissue lines surfaces such as the gutXylem carries water and mineral ionsPhloem carries sucrose and amino acidsOrgans & systemsOrgan: two or more different tissues working togetherHeart: muscle, connective and nervous tissueLeaf is a plant organ with epidermis, mesophyll, xylem, phloemSystem: group of organs doing a major body functionDigestive system: mouth, stomach, small intestine, pancreasExam tipsList levels in the correct order for full marksOne mark per correctly placed termTissue = similar cells; organ = different tissues