Related by context. Frequent words. (Click for all words.) 63 ear canals 62 nasal passages 58 pharynx 58 nasal passage 57 bronchial tubes 57 ear canal 56 lymphatic vessels 55 intestines 55 capillaries 54 diaphragm 54 alveoli 54 soft palate 54 sinuses 53 trachea 53 eardrum 53 nasal cavity 53 upper airway 53 sweat glands 53 cochlea 53 secretions 52 spinal canal 52 stomata 52 mucosa 52 urethra 52 sensory neurons 52 duodenum 52 airways 51 glands 51 narrowed arteries 51 orifices 51 blood vessels 50 fallopian tubes 50 lungs 50 optic nerves 50 cavities 50 nostrils 50 airway 50 cilia 50 intestine 50 bladder 50 mucus membranes 50 sebaceous glands 49 air sacs 49 neural pathways 49 digestive tracts 49 nerve endings 49 adenoids 49 mucous membrane 49 pulmonary artery 49 sphincter 49 salivary glands 49 septum 49 nerve impulses 49 cochlear 49 tracheal 48 ulcerations 48 epithelium 48 ion channels 48 GI tract 48 vagus nerve 48 cerebrospinal fluid 48 bile ducts 48 optic nerve 48 fallopian tube 48 lobes 48 swellings 48 atria 48 vagina 48 secretion 48 ventral 48 carotid arteries 47 peripheral nerves 47 anus 47 pores 47 dorsal 47 spinal column 47 bleeding gums 47 ureter 47 mucous 47 mucous membranes 47 apertures 47 nostril 47 forebrain 47 auditory nerve 47 intestinal tract 47 esophagus 47 pulmonary valve 46 abdomens 46 nerve fibers 46 ventricles 46 brainstem 46 fibrous tissue 46 abscesses 46 respiratory tract 46 windpipe 46 cannula 46 cavity 46 mandibles 46 neurones 46 ducts 46 alveolar