Term
1. sensory receptor
2. interneuron
3. brain |
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Definition
| For you senses to work, a specific stimulus must stimulate a specific _____ _____, which the impulse to an ______ that relays the impulse to other interneurons in special areas of the _____. |
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Term
1. identical
2. interpreting
3. sensations |
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Definition
| The impulses going to the brain are _____, but different sense organs send the impulses to special areas of the brain that are responsible for _____ the impulses as ______. |
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Term
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Definition
| Located around the eye, ______ ______ help protect the eye. |
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Term
1. foreign objects
2. perspiration
3. light rays
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Definition
| The eyebrows, eyelids, and eyelashes prevent _____ _____, ______, and direct ____ _____ from entering the eye. |
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Term
1. Lacrimal gland
2. tears |
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Definition
| ______ ______ produce ____ that keep the eye moist, wash out foreign particles, and lubricate the eye. |
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Term
1. cornea
2. conjunctiva
3. sclera |
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Definition
| The outer layer of the eye is composed of two parts, the anterior ____ (covered by the thin _____) and posterior ____. |
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Term
1. choroid
2. sclera
3. ciliary body
4. iris
5. lens
6. suspensory ligaments |
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Definition
| The middle layer consists of the posterior _____, which covers most of the inner surface of the ____, and ____ ____ that connects to the ____(colored part of the eye) and ___ by ______ ______. |
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Term
1. pupil
2. iris
3. retina
4. fovea centralis |
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Definition
| The ____ is the opening in the ____. The inner layer, the _____, has a small depression, the ____ ____. |
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Term
1. optic nerve
2. optic disc
3. aqueous humor
4. anterior
5. vitreous humor
6. posterior |
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Definition
| At the posterior part of the eye, an ____ ____ penetrates the eye and forms the _____ ______. A watery _____ _____ fills the _____ chamber, and a jellylike _____ _____ fills the _____ chamber. |
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Term
1. sclera
2. choroid
3. retina
4. pigment |
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Definition
| The tough _____ gives the eye shape and protects its inner parts. The _____ contains blood vessels, which nourish the _____, and _____ that absorbs light. |
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Term
1. Photoreceptors
2. rods
3. light
4. cones
5. color
6. retina |
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Definition
| _________, _____ (sensitive to intensity of ____) and _____(sensitive to _____), are found in the _____. |
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Term
1. fovea centralis
2. cones
3. sharpness |
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Definition
| The ____ _____ contains a high density of _____ and is responsible for visual acuity (______ of vision). |
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Term
1. iris
2. pupil
3. cornea
4. aqueous humor
5. lens
6. vitreous humor |
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Definition
| The ____ controls the size of the _____, which allows light to enter the lens. Light is refracted by the _____, _____ _____, _____, and _____ _____. |
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Term
1. ciliary body
2. elastic lens |
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Definition
| Focusing is accomplished by the muscles of the ____ ____ contracting and relaxing, thereby changing the shape of the ____ ____. |
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Term
1. elasticity
2. lens
3. different distances
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Definition
| The ______ of the ____ determines how well the eye can accommodate (focus at _____ _____). |
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Term
1. ciliary body
2. flattened
3. contract
4. rounded |
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Definition
| When focusing on distant objects, the muscles of the _____ _____ relax and lenns is _____. When focusing on near objects, the muscles _____, and the elastic lens becomes _____. |
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Term
1. Presbyopia
2. near
3. far |
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Definition
| The loss of the lens' elasticity with age is called ______. Biofocal lenses are often used to enable the persons to focus at ____ objects with the bottom of the lens and at ____ objects with the top of the lenses. |
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Term
1. myopia
2. long
3. front
4. retina |
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Definition
| Nearsightedness (_____) occurs when a person's eyeball is too ___, and the object is focused in ____ of the _____. |
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Term
1. hyperopia
2. short
3. beyond
4. retina |
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Definition
| Farsightedness (_____) occurs when the eyeball is too ____, and the object if focused _____ the _____. |
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Term
1. visual acuity
2. Snellen eye chart |
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Definition
| The ability to distinguish objects according to a standard scale is called _____ _____. The ____ ____ ____ had letters average person can read a distances of 15, 20, 30, 40, and up to 200 feet. |
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Term
1. curvature
2. cornea
3. lens
4. astigmatism |
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Definition
| Uneven ______ of the ______ and/or the ______ produces a condition called ______. |
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Term
1. optic disc
2. rods
3. cones |
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Definition
| The _____ _____ had no ___ or ____; therefore, when objects are focused on this spot, you do not see them. |
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Term
1. sound waves
2. impulses
3. equilibrium |
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Definition
| The ear serves two functions: (1) converts ____ ____ to nerve _____ and (2) aids in maintaining _______. The ear is usually divided into the outer ear, middle ear, and inner ear. |
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Term
1. pinna
2. sound waves
3. auditory canal
4. middle |
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Definition
| The _____, the outer flap of skin and cartilage, deflects _____ _____ into the _____ _____ that channels sound waves to the _____ ear. |
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Term
1. tympanic membrane
2. vibrates
3. three ear ossicles
4. malleus
5. incus
6. stapes |
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Definition
| The middle ear begins at the ______ ______ (tympanum, eardrum), which _____ in resonnance with the sound waves and relays them to _____ _____ ______, the _____(hammer), _____(anvil), _______(stirrup). |
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Term
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Definition
| These ossicles ____ sound waves and _____ them to the inner ear. |
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Term
1. eustachian tube
2. middle ear
3. pharynx
4. tympanic membrane |
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Definition
| The ______ _____ connects the _____ ____ with the _____ and allows the air pressure to equalize on both sides of the _____ _____. |
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Term
1. vestibule
2. cochlea
semicircular canals |
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Definition
| The inner ear is composed of three fluid-filled bony structures, the oval ______, the coiled _____, and the _______ _____. |
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Term
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Definition
| The ____ ____ of the vestibule is in contact with the ____ and transfers sound waves to the fluids of the inner ear. |
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Term
1. round window
2. cochlea |
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Definition
| When the oval window vibrates inward, the ____ ____ (located at the beginning of the ____) vibrates outward. |
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Term
1. spiral organ
2. Corti
3. hair cells |
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Definition
| The ____ ____ (organ of ____) is the hearing organ or the hair cells. |
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Term
1. semicircular canals
2. auditory nerve
3. cochlea
4. semicircular canals |
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Definition
| Receptors sensitive to movement of the head and body are located in the _______ ______. The _____ ______ has two branches, one from the _____ and one from the _____ _____, and leads to the brain. |
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Term
1. one
2. two
3. one unstimulated
4. between |
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Definition
| For you to preceive on point of contact, ___ touch receptor must be stimulated. For you to percieve two points of contact, ___ touch receptors must be stimulated; but at least ___ ______ touch receptor must be ___ them. |
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Term
1. olfactory hairs
2. epithelial lining
3. nasal cavities
4. olfactory nerves |
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Definition
| The sensory receptors for smell are thought to be the _____ _____ that are located in the ____ ____ of the superior part of the ____ ____. The impulses are carried to the brain by the ____ ____. |
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Term
1. taste buds
2. papillae
3. impulse
4. olfactory nerves |
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Definition
| Several types of taste receptors are located in the ___ ___ of the ____ of the tounge. Before the receptors cam initiate an ____, the substance being tasted must be dissolved in ____. |
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Term
1. anterior tip
2. posterior center
3. anterior tip
4. sides
5. posterior sides
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Definition
| The receptors are classified according to their sensitivities: (1) sweet (___ ___ of the tounge); (2) bitter (____ ____); (3) salt (_____ ____ and ____); and (4) sour (_____ ____). Several nerves carry these impulses to the brain. |
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Term
1. sensations
2. impulses
3. taste
4. olfactory |
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Definition
| The different _____ perceived by the brain are produced by combinations of _____ received from the different types of ____ receptors and the _____ receptors. |
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