Group of cells carry out same functions Group

Group of cells carry out same functions Group of tissues carries out one or ore function Group of organs work together to carry out function Photosynthesis Transpiration

Group of cells carry out same functions Group of tissues carries out one or ore function Group of organs work together to carry out function Complete digestion Absorb digested food Move undigested food to colon

outer serosa Connective tissue Very thin protective & supportive mucosa In contact with food Highly specialised to increase SA Villi & microvilli muscularis externa Outer longitudinal muscle: pendular movements Inner circular muscle: local constrictions & peristalsis Churn & mix food lumen muscularis mucosa Thin layer muscle extends into centre villi Moves villi to increase contact with food in lumen submucosa Connective tissue/ blood vessels/ lymphatic tissue Transport absorbed food

Goblet cells: The inner layer of epithelial cells is highly folded & has specialised cells: • Secretes mucus • Protects lining against enzyme digestion & lubricates to facilitate movement Columnar epithelial cell: • Microvilli, increase SA for enzyme attachment • Mitochondria, energy, AT Together the microvilli form a Brush border Crypt of Lieberkuhn gland: • Cells at base continually divide by mitosis & move up the surface to replace cells that are sloughed off • Paneth cells have an antimicrobial function, protecting cell neighbours

Pinocytosis Simple diffusion lacteal AT & Facilitated Diff Capillary network Lymph vessels

lacteal muscosa muscularis mucosa submucosa muscularis externa serosa circular muscle longitudinal muscle