Related by context. Frequent words. (Click for all words.) 66 airway 64 nasal passages 58 lungs 55 sinuses 52 blood vessels 52 arteries 50 respiratory tract 49 trachea 48 lung tissue 48 mucus 47 nostrils 47 artery 46 blocked arteries 46 coronary artery 46 lung 45 coronary arteries 45 pores 44 capillaries 44 windpipe 44 sinus 44 intestines 44 Airway 43 air 43 secretions 42 clot 42 vocal cords 42 chest cavity 42 intestinal tract 42 intestine 42 airspace 42 nasal 42 airwaves 41 urethra 41 esophagus 41 bowel 41 ventricles 40 muscle tissue 40 blocked artery 40 gastrointestinal tract 39 ear canal 39 pulmonary 39 aorta 39 digestive tract 39 bladder 39 bloodstream 39 clots 39 respiratory 38 tissues 38 left ventricle 38 eyelids 38 cerebrospinal fluid 38 clogged arteries 38 soft tissues 38 small intestine 38 asthmatic 38 throat 38 glands 37 upper respiratory tract 37 nostril 37 gums 37 frequencies 37 cavities 37 airports 37 coughing 37 ventricle 37 chronic lung 37 cell membranes 37 lung function 37 eardrum 37 abdominal cavity 36 ears 36 uterus 36 asthma 36 aortic valve 36 scar tissue 36 chronic inflammatory 36 apnea 36 inhaled 36 edema 36 breathing 36 runny nose 36 tonsils 35 inflammation 35 hair follicles 35 asthmatics 35 muscles 35 coughs 35 cornea 35 sac 35 stomachs 35 COPD 35 obstructive sleep apnea 35 diaphragm 35 passageways 35 ducts 35 circulatory 34 mouths 34 lung infections 34 internal organs 34 allergens 34 uterine