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Ch.10 Hum Bio

Senses

QuestionAnswer
External Eye Conjunctiva, Lacramal Apparatus, Extrinsic Eye muscles
Conjunctiva Provides mucous(moisture),to help moisten lining of your eye
Lacrimal Apparatus 2 little black dots in the corner of the eye that are drain holes & for tears
Extrinsic Eye Muscles 6 muscles attached to the surface of the eye, contracting these muscles move the eye
Internal Eye Wall, Choroid, Retina
Eye wall 3 tunics...Sclera, Cornea, Choroid coat
Sclera outermost layer,white fibrous material *passage of light*
Stimulation Raw form which sensory receptors send info to brain..
Choroid coat filled w/blood vessels,contains pigment that absorbs light so dont bounce around more
Choroid Vascular; contains ciliary body & Iris
Ciliary Body holds & reshapes lenses, gives ability to look at stuff up close,pulls lens, takes break from eye strain
Iris smooth muscle, colored part of eye,determines size of pupil, changes size determines how much light to let in
Retina 3rd layer, inner sensory,photo receptors,has rods & cones
Rods used for low light situations; gray tones when its dark
Cones Bright lights & colors;accurate vision
Optic Nerve Blind spot; bundle of axons leaving the eyes
Lens focus light into retina,divides eye into anterior & posterior
Anterior Lens Cornea & Aqueous Humor
Aqueous Humor produce & drain; transports material(o&sugar)to cornea & lens; fills open space**bathing lens**
Cornea cornea to lens; both living tissue,clear part you touch when one puts contacts in
Posterior Lens Lens to retina; Vitreous Humor
Vitreous Humor jelly like fluid, retains shape of eye, floaters get trapped *reinforce back of eye**
Refracted(bent) Vision light can be bent when light passes thru eye
Distant Vision 20ft/beyond w/relaxed eye light rays come in parallel, start bending to get to lens
Near Vision 20ft/less; light rays hit cornea & bend then fall on retina **reshape lens**
Accommodation Adjustment of lens of the eye for close or distant vision
Refractions far sighted; light rays hit retina before converge
Mechanoreceptors Ear Outer, Inner & middle ear,
Outer Ear Has 3 parts
Middle ear (tympanic cavity) Air Filled space in Temporal bone,has Aud. Ossicles & Tube,
Auditory Ossicles has 3 tiniest bones attach to tympanic cavity,covered w/mucous membrane, transfers energy & vibrations
Auditory Tube connects middle ear to throat,maintains = pressure both sides eardrum,needed for hearing
Inner ear Fluid Filled,complex system,contains chambers & tubes Labyrinth
Physical Factor Ear Pinna,External Aud. Tube, Tympanic Membrane.
Pinna (Auricle) Funnel like structure;Sound gathers here& sends to meatus
External Acoustic Meatus S-shaped tube; ear canal,thru temporal bone,
Tympanic Membrane(Eardrum) has Cochlea, vestibule,semi-circular canals
Vestibule Static equilibrium found here,bony chamber
Cochlea inner ear,Contains Organ of Corti, the sensory organ of hearing,
Semi Circular Canals provides sense of Dynamic Equilibrium
Mechanism Of Hearing Cochlea,
Energy of hearing crosses the organ of corti, pushes membrane, bends hairs, generates impulses
Mechanism of Balance Vestibule & Dynamic Equilibrium
Dynamic Equilibrium semi circular canals;Crista Ampullaris,contains mechanoreceptors
Vertigo brain receives conflicting information
Macula many hair cells,serve as sensory receptors
Crista Ampullaris Contains sensory hair & supporting cells
Chemoreceptors Patch of cells for smell, must dissolve in H20 first
Chemical Senses Taste & smell
Smell located in the nasal cavity
Taste Sensation four sensation you taste
Four Sensations Sweet= sugar Sour= Acid Bitter= Base Salty= Metal
Sweet sugar
Sour Acid
Bitter Base
Salty metal
Sensation occurs when brain becomes aware of sensory impulses
Perception when brain interprets sensory impulses
Cerebral Cortex Determines pain intensity
Enkephalins & Endorphins suppress acute & chronic pain impulses
Olfactory(smell)Receptors Bipolar nuerons
Created by: 1298518297
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