Special senses L1 0.0 / 5 ? PharmacyTaste and smellUniversityNone Created by: RscottqubCreated on: 29-03-19 18:50 Gustation tatse 1 of 31 olfactory tissue tongue 2 of 31 papillae bumps on tongue - contain taste buds 3 of 31 Circumvallatae papillae V shape at back of tongue . lots of taste buds 4 of 31 Fungiform papillae moderate no taste buds, tip of tongue 5 of 31 Foliate papillae mod number . side of tongue. (lateral) 6 of 31 what are taste buds 40-60 modified epithelial cells - these mod cells are either taste cell or basal or supporting cells 7 of 31 taste cells are replaced constantly by mitosis 8 of 31 how are taste cells arranged around a taste pore - each T cell has hair/m.villi which pertrudes out of pore to expose self to chemicals 9 of 31 T cell is a neurone? no - its is not - t cell synapses with senspry nerve fibre at base 10 of 31 how do chemicals create AP chemicals react with villi- causing depolarisation- will keep stimulating until washed away by saliva 11 of 31 5 elementary tatse sensations Bitter, sweet, sour, salty, Umami * see diagram for locations 12 of 31 can the 5 sensations be experienced anywhere one tongue yes , but diff regions tend to be more sensitive to 1 particular sensation 13 of 31 Sour cause H+ ions. 14 of 31 Salty cause- ionised salts, cations mainly resposnible - ie Na+ 15 of 31 Sweet not caused by any one type of molecule. most are however organic substances and if they undergo a slight change will turn bitter 16 of 31 Bitter again not caused by any one mol. almost always organic sub. 2 classes - alkaloid/longchain containing N 17 of 31 Umami japanese- delcious - food containing L-glutamate 18 of 31 posterior of tongue makes up what proportion 1/3 19 of 31 anteriour tongue 2/3 20 of 31 posterior is connected to what nerve Glossopharynegeal 21 of 31 anterior is connected to what nerve Facial nerve 22 of 31 olfaction smell 23 of 31 olfactory cells form a patch of epithelium called olfactory muscosa in roof of nasal cavity 24 of 31 what are olfactory cells bipolar cells 25 of 31 cells have neck and head which posses olfactory hairs 26 of 31 olfactory hairs project into mucus 27 of 31 basal ends form small fasicicles which leave nasal cavity thru pores in BONE 28 of 31 once leave enter the olfactory bulbs - beneath frontal love of brain 29 of 31 axons leave bulbs forming olfactory tracts --> cortex - conscious sensation of smell 30 of 31 loss of smell occurs when nasal cavity is inflammed 31 of 31
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