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Special Senses. Sense of Smell and Taste. Receptor for these senses are chemoreceptors Senses closely related Four types of taste receptors Many types of smell receptors. Taste buds. Taste buds Receptors for taste Papaille Four Types 6 tastes Sweet, bitter, savory Salty, spicy, sour.
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Sense of Smell and Taste • Receptor for these senses are chemoreceptors • Senses closely related • Four types of taste receptors • Many types of smell receptors
Taste buds • Taste buds • Receptors for taste • Papaille • Four Types • 6 tastes • Sweet, bitter, savory • Salty, spicy, sour
Which is not a type of taste sensation? • Spicy • Bitter • Rotten • Sour
Olfactory Receptors • Olfactory receptors • Postage stamp area at top of nasal cavity • Olfactory receptor cells • Hairs bathed in mucosa • Olfactory filaments (olfactory nerve) • Stimulated by chemicals in mucus
Sense of Hearing • Outer Ear • Pinna (auricle) • Outside of ear collects sound waves • External auditory canal • Tube from pinna to ear drum
The mucosa in the nose is similar in function to the _______ of the eye. • Conjunctiva • Sclera • Tears • Cornea
Sense of Hearing • Middle Ear (tympanic cavity) • Eardrum • Ossicles • Hammer transfers vibration to anvil • Anvil transfers vibration to stirrup • Strirrup transfers vibration to oval window • Oval Window • Sets fluid in inner ear into motion
Sense of Hearing • Inner Ear • Bony labyrinth • Cochlea • Contains organ of Corti which contains hair cells • Vestibule • Semicircular canals
Which of these is not an ossicle of the middle ear • Anvil • Pina • Stirrup • Hammer
How Do We Hear • Anvil transmits wave to oval window • Tectorial membrane moves bending or tweaking the hairs in the organ of Corti • Hairs closer to oval window stimulated by high pitch • Hairs further down cochlea stimulated by low pitch • Hairs send pulses to brain through cochlear nerve
Equilibrium • Sense of Balance • Depend on vestibule and semicircular canals • Responds to movements of our head • Two parts • Static and dynamic equilibrium
Static Equilibrium • Maculae in vestibule report on changes in position when at rest • Help tell which way is up • Helps divers know which direction is surface
Dynamic Equilibrium • Receptors are found in semicircular canals • Respond to angular or rotational disturbances • Receptors orientated in all three planes to sense any disturbance