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sensory; changes The _______ system protects a person by detecting _______ in the environment. stimulus; nerve impulse An environmental change becomes a _______ when it initiates a ________ ________. sensory / afferent A stimulus travels to the central nervous system by way of a ________ neuron. homeostasis The sensory system helps maintain ________. sensory receptor The part of the nervous system that detects a stimulus is the ________ ________. stimulus Receptors can be classified according to the type of ________ to which they respond. taste; smell Chemoreceptors detect ________ and ________. photoreceptors; retina ________ are located in the ________ of the eye, and respond to light. thermoreceptors ________ detect change in temperature, and are located in the skin. movement Mechanorecptors respond to _______. threshhold stimulus A stimulus of adequate intensity is known as a _______ _______. threshold; nerve impulse Any receptor must receive a _______ stimulus in order to respond and generate a _______ _______. special; special sense A _______ special sense is located in a _______ _______ organ. genera sense A _______ _______ is widely distributed throughout the body. special senses Vision, hearing, equilibrium, taste, and equilibrium are all _______ _______. skin; internal organs Pressure, temperature, pain, and touch our receptors found in the _______ and ________ ________. eyelashes; eyebrow The _______ and _______ help to keep foreign matter out of the eye. conjunctiva; eyelid; sclera A thin membrane called the ________ in lines the inner surface of the _______ and covers a visible portion of the white of the eye, (the _______). lacrimal; lubricate; infection Tears produced by the _______ glands _______ the eye and contains an enzyme that protects against _______. runny nose An excess of two years causes a "_______ _______". tunic The sclera is the outermost _______. connective; white of the eye The sclera is made of tough ________ tissue and is commonly referred to as the "_______ ____ ____ _____" choroid The _______ is it the second tunic of the eyeball. choroid; inner The _______ maybe compared to the Dole blacked lining of a camera that prevents incoming light rays from scattering and reflecting off the eye's _______ surface. innermost The retina is the _______ tunic. retina The _______ is the eyes actual receptor layer. innermost The tunic's _______ layer is the eyes actual receptor layer. receptor; rods; cones The retina is the eyes actual _______ layer and contains light sensitive cells known as _______ and _______. refraction _______ is the process of bending light rays as they pass from one substance to another substance of different density 3,1,2,4,5 List the order in which light travels through the eye: (1) aqueous humor; (2) lens; (3) cornea; (4) vitreous body; (5) retina rods; sharp image The _____ or highly sensitive to light and thus function and in light, but they do not provide a _______ _______. bright; color; sharp images The Cones function in _______ light, are sensitive to _______, and give _______ _______. color blindness _______ _______ results from a lack of rectal cones. rectal cones Color blindness results from a lack of _______ _______ A; rhodopsin; night blindness If a person is lacking in vitamin ____, and thus ________, he or she may have _______ _______. dim; rods A person who has difficulty seeing in _____ light because the light is in adequate to activate the _____, they have night blindness. extrinsic The voluntary muscles attached to the eyeball's outer surface are called the _______ muscles. extrinsic muscles The _______ _______ pull on the eyeball in a coordinated fashion so that both eyeballs center on one visual field. A) tunics; B) vitreous body; C) suspensory ligaments; D) cornea; E) iris; F) muscle ciliary; G) conjunctival sac http://o.quizlet.com/i/aGQ2wlP3mSM88jFTL8ffNw.jpg A) sclers; B) choroid; C) retina; F) pupil; G) lens; H) optical nerve http://o.quizlet.com/i/-RiVmDKOAQr9As9JS5jnGQ.jpg iris; two The _______ is the colored or pigmented part of the eye and is composed of ______ sets of muscle fibers. size The iris governs of the ______ of the iris's central opening. pupil The central opening of the iris is called the _______. equilibrium The ear is the sense for again for both hearing and ________. outer, middle, inner ear The ear is divided into what the three main sections? tympanic membrane; external auditory The _______ _______, or your drum, is at the end of the ________ ________ canal. middle ear; vibrates The boundary of the tympanic membrane is between the external auditory canal and the _______ _____ cavity, and it _______ freely as sound waves enter into the ear. ossicles The middle ear cavity is a small, the contains three small bones, or ________. static equilibrium Receptors located in the vestibule's to small chambers sense _______ _______. head; body; straight Static equilibrium is the position of the ______ or the position of the ______ when moving in a _______ line. equilibrium / balance The sensory receptors in the inner ear are those related to ________. dynamic equilibrium When the body is spinning a moving in different directions that is called _______ _______. cristae; semicircular The receptors that sense dynamic equilibrium are called _______ and are located at the bases of the ____________ canals. gustation The sense of taste is called _______. taste buds Taste receptors are known as _______ _____. olfaction The sense of smell is called _______. tacile corpuscles Touch receptors are called _______ _______. smell The interpretation of _______ is closely related to the sense of taste, but a greater variety of chemicals can be dissolved by this sense. blod; barroreceptors Three receptors in the walls of the large arteries that monitor _______ pressure are called _____________. temperature; nerve endings; heat; cold The ________ receptors are free _______ _______ and are widely distributed in the skin. There are separate receptors for ______ and ______. proprioreceptors Recepttors located in the muscles tendons and joints are called ________. position; location Proprioreceptors judge one's _______ and changes in the _______ of body parts in relation to each other. skin; muscles; joints; internal Pain receptors are widely distributed in the ______, ______, and ______ and to a lesser extent in most _______ organs.