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Sense Organs

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Term
Definition
Sensory organs   Provide us with information about our surroundings and our internal activity  
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Receptors   Detect stimuli and generate impulses  
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Sensory tracts   Functionally related bundles of fibers in the white matter of the spinal cord or brain  
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Sensory area   Interpret sensory input  
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Chemoreceptors   React to chemicals  
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Mechanoreceptors   Respond to pressure stretch or vibration, Physical movement  
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Thermoreceptors   Respond to temperature  
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Nociceptors   Detect tissue damage and give the sense of pain  
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Photoreceptors   Detect light  
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Projection   The perception of sensation in any given area  
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Intensity   Determined by the number of receptors stimulated and the amount of stimulation in each  
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Adaptation   Becoming less aware of continuing stimulation  
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Contrast   Effect of the previous or simultaneous sensation on a current sensation  
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Fast fibers   Sharp stabbing pain like when you have an injury  
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Slow fibers   Dull achy pain  
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Referred pain   Pain from a visceral organ felt in a cutaneous area  
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Pain   Detected by nociceptors  
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Temperature   Detected by free nerve endings located in the skin  
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Touch   Specialized nerve endings most of which are mechanoreceptors, Sense pressure and stretch  
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Taste   Results when chemicals come in contact with taste buds  
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Taste buds   Made of receptors called gustatory cells  
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Olfaction   Smell  
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Olfactory receptors   Detect vaporized chemicals in the upper nasal cavity  
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Outer ear   Includes the auricle and ear canal  
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Auricle   Funnels sound into ear canal  
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Ear canal   External acoustic meatus lined with ceruminous and sebaceous glands ends at the eardrum  
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Middle ear   Air filled cavities that contains the ossicles and is drained by the eustachian tubes  
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Eardrum   Vibrates with sound waves and transfers energy to ossicles  
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Auditory ossicles   Transfers and amplifies sound to the oval window of the inner ear  
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Eustachian tube   Equalizes pressure on both sides of the tympanic membrane  
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Otitis media   Middle ear infection  
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Inner ear   Cavity known as the bony labyrinth in the temporal bone  
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Membranous labyrinth   Lines the inside of the bony Labyrinth  
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Perilymph   Fluid between bone and membranous labyrinth  
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Endolymph   Fluid within the membranous labyrinth  
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Cochlea   Snail shaped structure for hearing  
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Cochlear duct   Contains the organ of corti  
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Organ of corti   AKA Spiral organ  
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Tectorial membrane   Presses against the hair cells to trigger depolarization  
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Round window   Bulges out to relieve pressure when the oval window is depressed  
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Balance   AKA Equilibrium  
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Vestibular Apparatus   Includes the utricle and saccule  
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Semicircular canals   Responsible for dynamic equilibrium  
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Ampulla   Located at the base of each semicircular Canal  
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Eyelids   Protects lubricates and cleans the eye  
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Eyebrows   Enhances facial expressions aiding in nonverbal communication  
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Conjunctiva   Transparent mucous membrane that lines the inner surface of the eyelid and covers the anterior surface of the eyeball  
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Palpebral fissure   The opening between the lids  
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Lacrimal punctum   Tiny pores through which tears drain into the lacrimal canal and the nasolacrimal duct  
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Lacrimal gland   Produces tears  
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Nasolacrimal duct   Carries tears into the nasal cavity  
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Fibrous tunic   Contains the sclera and the cornea  
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Sclera   White part of The eye  
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Cornea   Transparent portion of the eye  
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Vascular tunic   Includes choroid layer ciliary body and the iris  
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Choroid layer   Absorbs light in the eye to prevent glare  
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Ciliary body   Changes the shape of the lens so we can focus  
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Iris   Colored part of the eye  
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Pupil   The opening in the iris  
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Dilation   Contraction of the radio fibers, let's more light in  
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Constriction   Contraction of the circular fibers, blocks Light when bright  
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Retina   The inner layer of the eye, contains visual receptors – rods and cones  
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Rods   Detect all wavelengths of visible light  
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Cones   Detect colors  
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Optic disc   Opening where the optic nerve exits The eye  
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Posterior cavity of the eye   Between the lens and retina  
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Anterior cavity   Between the lens and cornea  
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Physiology of vision   Light is focused on the retina, receptors generate impulses, visual areas of the brain interpret  
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Aqueous humor   Fills the anterior cavity  
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Reflection   Bending of light rays  
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Convergence   Lines up the visual axis of each eye towards the object so that the light rays fall on the corresponding spots on each retina  
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Visual acuity   The sharpness of visual perception  
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Intrinsic eye muscles   Muscles that constrict and dilate the pupil  
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Pupillary constrictor   Encircles the pupil, narrows the pupil to admit less light  
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Pupillary dilator   Widens the pupils to admit more light  
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Accommodation   When the curvature of the lens changes to allow the eye to focus on a near object  
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Photopupillary reflex   When pupils constrict automatically when exposed to bright light  
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Sensory pathways   Include the receptors, sensory neurons, sensory tracts, sensory area  
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Cerebral cortex   Sensory area is usually found in the  
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Chemoreceptors   React to odors, tastes, blood chemistry, etc.  
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Proprioceptors   The type of mechanoreceptors in muscles and joints  
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Sound   Mechanoreceptors can also detect _____  
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Phantom pain   Perception of pain in an area that doesn't exist  
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Cerebral cortex   Projection is "actually" felt in the _____  
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Neuron   Each receptor is attached to a _____ that goes to a specific part of the brain from a specific part of the body  
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Stimulation   Receptors generate fewer impulses with continued _____  
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Fast fibers   Abundant in the skin and mucous membranes  
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Slow fibers   In deep body organs  
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Pressure   The sense of touch detects touch and _____  
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Taste buds   Type of taste receptors  
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Taste cells   Taste buds are also called _____  
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Chemoreceptors   Detect chemicals in food dissolved in saliva  
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Papillae   Bumps on the tongue  
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Vallate, foliate, filiform, fungiform   The four types of papillae  
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Outer ear, middle ear, inner ear   The three areas of the ear  
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Auricle   Elastic cartilage covered with skin  
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Tympanic membrane   Another name for the eardrum  
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Eardrum   Separates the middle ear from the outer ear  
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Malleus, incus, stapes   The three parts of the auditory ossicles  
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Mallet/hammer   Malleus resembles a _____  
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Anvil   Incus resembles an _____  
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Stirrup   Stapes resembles  
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Auditory tubes   Another name for eustachian tubes  
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Nasopharynx   Eustachian tubes extend from the middle ear to the_____  
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Air   Eustachian tubes permit _____ to enter or leave  
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Elevation   Eustachian tubes can plug and cause pressure in ere when changing _____  
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Three   The cochlea is partitioned into _____ fluid filled canals  
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Organ of corti   The hearing sense organ  
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Vestibule   Utricle and saccule are membranous sacs in the _____  
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Semicircular canals   Three fluid filled membranous ovals oriented in different  
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Palpebrae   Another term for eyelids  
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Skeletal muscles   Eyelids are controlled by _____  
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Dust   Eyelashes prevent  
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Spreads   Lacrimal ducts released tears and blinking _____ them  
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NaCl   Tears are 1%  
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Isozymes   Tears contain  
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Eyeball   Within the orbit formed by lacrimal, maxillary, zygomatic, frontal, sphenoid, and ethmoid bones  
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Six   ___ Extrinsic muscles move the eye  
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Outer layer, middle layer, ciliary body   The three layers of the eye  
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Outer layer of the eye   Includes the Scalera and the cornea  
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Middle layer of the eye   Includes choroid layer, ciliary body, and the iris  
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Ciliary body   Circular muscle that surrounds and is connected to the lens by suspensory ligaments  
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Anterior   The iris is _____ to the lens  
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Melanin   Iris gets its color from _____  
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Blind spot   Area in which there are no visual receptors  
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Vitreous chamber   Another term for the posterior cavity of the eye  
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