bacteria as part of the intestinal microbiome in the digestive tract

abdomen anatomical anatomy bacteria bacterial biology biome biota bowel cell cells colon digestion digestive eat food gastric gastrointestinal germ germs glands goblet gut guts health healthcare human illustration intestinal intestine intestines juices magnification medicine micro microbiome microbiota microscope organ part process reduction salivary small system tract villi villus viruses walls