Related by context. Frequent words. (Click for all words.) 59 hair follicles 59 glands 58 nerve endings 56 secretions 55 secretion 55 melanin 54 excessive sweating 54 nasal passages 54 follicles 53 thyroid hormone 53 testes 52 salivary glands 52 gland 52 collagen 52 blood vessels 51 adrenal glands 51 nerve impulses 51 epidermis 51 perspiration 50 mucus 50 pores 50 melanocytes 50 capillaries 50 mucous membranes 50 uric acid 50 dermis 49 mucous 49 nerve cells 49 androgens 49 vagus nerve 48 cortex 48 adrenal gland 48 thyroid gland 48 fatty tissue 48 neurons 48 cochlea 48 stress hormones 48 follicle 48 electrical impulses 48 metabolism 48 cortisol 48 digestive enzymes 48 receptors 47 glutathione 47 muscle tissue 47 cilia 47 muscle fibers 47 mitochondria 47 physiologic 47 epithelial cells 47 ear canal 47 facial muscles 47 physiologically 47 physiological 46 serotonin 46 muscles 46 neurones 46 nitric oxide 46 respiratory tract 46 overactive 46 reactive oxygen species 46 hair follicle 46 immune cells 46 nerve fibers 46 pituitary 46 lungs 46 circulatory system 46 cerebellum 46 histamine 46 mammalian 46 air sacs 46 gastrointestinal tract 46 hormone estrogen 46 dehydrate 45 bladder 45 adrenal 45 lactic acid 45 acetylcholine 45 sinuses 45 ovaries 45 upper airway 45 excrete 45 respiration 45 hormones 45 tissues 45 epithelium 45 thymus 45 electrical currents 45 cytokines 45 elastin 45 itchiness 45 estrogen 45 pancreas 45 circulatory 45 nasal cavity 45 neuron 45 lymphatic 44 toxins 44 skeletal muscle 44 electrical pulses 44 nostrils