IB2.5.3 Animal tissues © Oxford University Press 2011 Animal tissues

IB2.5.3 Animal tissues © Oxford University Press 2011 Glandular stomach tissue  Layer of cells  Cells are very active making and releasing products  Some cells make chemicals like acids  Some cells make thick mucus to coat the cells  Some of the cells make enzymes for digestion  Lines the inside of organs

IB2.5.3 Animal tissues © Oxford University Press 2011 Epithelial tissue  Often smooth, to allow the organ to move easily around other organs  Layers of cells  Arranged very evenly  Forms a protective coat around an organ

IB2.5.3 Animal tissues © Oxford University Press 2011 Muscle tissue  Cells are long and thin  Cells filled with lots of contracting proteins  Cells able to contract and relax which allows them to change shape and, in turn, to change the shape of the tissue  Changing the shape of the tissue causes movement of the tissue or of the fluids around it