Related by context. Frequent words. (Click for all words.) 58 lung tissue 58 lungs 56 blood vessels 55 sacs 54 capillaries 52 nerve cells 52 soft tissues 51 connective tissues 51 vasculature 51 muscle tissue 50 epithelial cells 49 hair follicles 49 trachea 49 nasal passages 49 upper airway 49 circulatory system 49 epithelium 49 nasal cavity 48 cilia 48 fibroblasts 48 neurones 48 motor neurons 48 intestines 48 lobes 48 nerve fibers 48 ventricles 48 atria 48 urethra 47 bile ducts 47 mucus 47 secretions 47 mucosa 47 muscle fibers 47 airways 47 lung 47 diaphragm 47 cochlea 47 cysts 47 glands 46 cerebrospinal fluid 46 intestine 46 internal organs 46 artery walls 46 abdominal cavity 46 sweat glands 46 skeletal muscles 46 connective tissue 46 testes 45 rumen 45 cerebellum 45 chest cavity 45 fatty tissue 45 axons 45 spinal canal 45 neurons 45 membranes 45 eosinophils 45 peripheral nerves 45 tissues 45 cell membranes 45 gland 45 mucous 45 left ventricle 44 windpipe 44 digestive tract 44 motility 44 pores 44 vesicles 44 nerve endings 44 filaments 44 respiratory tract 43 sac 43 bladder 43 aorta 43 clot formation 43 hypertrophy 43 macrophage 43 myelin 43 swellings 43 fallopian tube 43 abdomens 43 pancreas 43 lesions 43 progenitor cells 43 ear canal 43 gill 43 musculature 42 intestinal tract 42 reproductive organs 42 follicles 42 nostrils 42 dermis 42 epithelial 42 metabolisms 42 articular cartilage 42 endothelial 42 sinuses 42 coronary arteries 42 salivary glands 42 Blood clots 42 esophagus