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36 Cards in this Set
- Front
- Back
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sensory system
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provides up with an awareness of our external and internal envieonments
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sensory receptors
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detects a stimulus
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chemoreceptors
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receptors for taste and smell
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photoreceptors
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responds to light
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thermareceptors
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detect changes in environment
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mechanorecptors
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respond to movement such as stretch, pressure or vibration
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threshold stimulus
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stimulus of adequate intensity
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special sense
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vision, hearing, equilibrium, taste, smell
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general sense
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throughout the body
pressure, temperature, pain, touch and sense of position |
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eye
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-delicate organ and protected by
-skull bones form eye orbit and protect posterior part of the eyelid -upper and lower eyelids aid in protecting the eyes anterior portion- keep harmful materials out of the eye and blinking lubricates the eye -eyelashes and eyebrows help to keep foreign matter out of the eye -conjunctiva- lines the inner surface of the eyelids and covers visible portion of the site of the eye -lacrimal glands- produce tears to lubricates eye and contain enzyme to protect against infection |
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sclera
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made of tough connective tissue and commonly referred to as white of the eye
outermost layer of eye |
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choroid
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middle layer of eye that is pigmented
composed of delicate network of connective tissue |
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retina
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eyes actual receptor layer
innermost layer contains light sensitive cells- rods and cones |
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refraction
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bending of light rays as they pass from one medium to another of a different density
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rods
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highly sensitive to light and thus function best in dim light do not provide shape image
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cones
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function best in bright lights are sensitive to color and give sharp images
localized at retinal center |
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extrinsic muscles
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voluntary muscles attached to eyeballs outer surface
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convergence
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centering of not eyes on same visual field
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intrinsic muscles
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involuntary muscles located within the eyeballs
form the iris and ciliary muscle |
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iris
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visible pigmented part of eye
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pupil
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iris's central opening
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ciliary muscles
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eye muscle that controls the shape of the lens
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optic nerve
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carries visual impulses from rods and cones to the brain
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opthalamic branch of the trigeminal nerve
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carries impulses of pain, touch and temperature
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optic disk
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blind spot
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oculmotor nerve
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supplies voluntary and involuntary motor impulses to all but two eye muscles
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trochlear nerve
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supplies superior oblique extrinsic eye muscle
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abducens nerve
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supplies lateral rectus extrinsic eye muscles
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ear
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sense organ of hearing and equilibrium
diving into three sections- outer, middle and inner ear |
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outer ear
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outer projection and canal ending at membrane
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middle ear
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air space containing three small bones
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inner ear
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most complex
contains sensory receptors for hearing and equilibrium |
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equilibrium
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sense of balance
receptors respond to acceleration and are ciliated hair cells |
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gustation
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sense of taste
involve receptors in tongue and two different nerves that carry taste impulses to brain |
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taste buds
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taste receptors
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basic tastes
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sweet, salty, sour, bitter, umami
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