Related by context. Frequent words. (Click for all words.) 66 lungs 63 lung 56 muscle tissue 55 intestines 54 trachea 54 epithelial cells 53 blood vessels 53 intestine 52 fibroblasts 52 respiratory tract 51 tissue 51 hair follicles 51 esophagus 51 tissues 50 nasal passages 50 soft tissues 50 intestinal tract 50 chest cavity 50 cartilage 50 neutrophils 50 internal organs 49 abdominal cavity 49 pancreas 49 windpipe 49 digestive tract 49 aorta 49 small intestine 48 airways 48 bloodstream 48 ear canal 48 endothelial cells 48 nerve cells 48 fatty tissue 47 cerebrospinal fluid 47 motor neurons 47 pulmonary artery 47 capillaries 47 scar tissue 47 mucus 47 gastrointestinal tract 47 mucous 47 epithelial 46 mitochondria 46 cell membrane 46 tumor cells 46 tooth enamel 46 fallopian tubes 46 sinuses 46 coronary artery 46 liver 46 immune cells 46 GI tract 46 muscle fibers 45 skeletal muscle 45 ovary 45 diaphragm 45 epidermis 45 clot 45 lymphocytes 45 prostate gland 45 lung function 45 spinal cord 45 secretions 45 cells 45 uterus 45 cardiomyopathy 45 inflammation 45 abdominal wall 44 membranes 44 macrophages 44 neurons 44 nerve endings 44 Left untreated 44 airway 44 spinal column 44 eardrum 44 tendons 44 urethra 44 nerve fibers 44 cell membranes 44 connective tissue 44 colon 44 artery walls 44 biofilm 44 bladder 44 optic nerve 44 reproductive organs 44 tumor 44 pores 44 vesicles 43 sacs 43 clots 43 abdomen 43 left ventricle 43 tumors 43 ovaries 43 myocardial 43 ventricle 43 myelin 43 vital organs 43 adrenal glands