Related by context. Frequent words. (Click for all words.) 67 bronchi 65 air sacs 61 lymphatic vessels 61 bronchial tubes 59 sacs 59 pulmonary arteries 59 alveolar 58 capillaries 57 lung tissue 57 vesicles 56 lungs 55 pleural 54 mucosa 54 bile acids 54 atria 54 epithelial cells 54 lysosomes 54 blood vessels 53 vesicle 53 cell membrane 53 nasal cavity 53 epithelium 53 pulmonary artery 53 stomata 53 organelle 53 fibrotic 53 epithelial cell 52 myocardium 52 mucous membrane 52 duodenum 52 circulatory system 52 abdominal organs 51 fibrous tissue 51 stroma 51 plasma membrane 51 fibroblasts 51 vasculature 51 atherosclerotic plaques 51 ventricles 51 calcium ions 51 lipoproteins 51 outer membrane 51 neuronal cell 51 nerve cells 51 extracellular 50 mucous 50 endothelial 50 resorption 50 ventricle 50 hypertrophy 50 upper airway 50 leukemic cells 50 connective tissues 50 tau protein 50 pharynx 50 skeletal muscle 50 sebaceous glands 50 synovial fluid 49 micelles 49 abdominal cavity 49 nitric oxide NO 49 endothelial cell 49 annulus 49 cerebrospinal fluid 49 adipocytes 49 neurones 49 reactants 49 epithelial 49 ascites 49 clot formation 48 chondrocytes 48 motor neurons 48 peritoneum 48 uterine wall 48 dermis 48 endothelial cells 48 endocytosis 48 spinal canal 48 respiratory tract 48 intestines 48 peripheral nerves 48 skeletal muscles 48 tissues 48 soft tissues 48 atherosclerotic plaque 48 endothelium 48 capillary 48 Nitric oxide 48 ectopic 48 GI tract 48 intestine 48 oxygenated blood 48 cell membranes 48 connective tissue 48 left ventricle 48 nucleosomes 48 outermost layer 48 mucous membranes 48 fibrin 47 membranes 47 secretions