Related by context. Frequent words. (Click for all words.) 78 GI tract 76 digestive tract 70 small intestine 68 intestines 67 intestinal tract 67 intestine 62 bloodstream 60 digestive 60 respiratory tract 59 mucous membranes 58 esophagus 58 salivary glands 58 pancreas 58 urinary tract 57 blood vessels 57 tissues 57 cell membrane 56 mucosal 56 vasculature 55 thyroid gland 55 abdominal cavity 55 nasal passages 55 cell membranes 55 inflammation 55 lymph 55 lymphatic system 55 dermis 55 tumor cells 54 bowel 54 gastrointestinal 54 epithelial cells 54 immune cells 53 colon 53 oral cavity 53 intestinal 53 uterus 53 muscle tissue 53 soft tissues 53 fatty tissue 53 intracellular 52 nerve cells 52 esophageal 52 abdominal wall 52 metabolized 52 enzymes 52 retina 52 endothelial cells 51 bacteria 51 prostate gland 51 nerve fibers 51 excreted 51 bladder 51 proteins 51 cochlea 51 malignant cells 51 urethra 51 diseased cells 51 lipids 51 liver 51 capillaries 51 neutrophils 51 nerve endings 50 pathogenic bacteria 50 motility 50 enzyme 50 glutamate 50 macrophages 50 cerebrospinal fluid 50 reactive oxygen species 50 lesions 50 molecule 50 micro organisms 49 lymphocytes 49 excretion 49 gastro intestinal 49 receptors 49 tumors 49 placenta 49 gastric 49 skeletal muscle 49 rectum 49 cancerous cells 49 dermal 49 optic nerve 49 stomach acid 49 histamine 49 adipose tissue 49 uterine 49 microorganisms 49 internal organs 49 left ventricle 49 tissue 49 secretion 49 adrenal gland 49 secretions 48 trachea 48 adrenal glands 48 mucus 48 ear canal 48 Inflammation 48 protein