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Three oval canals in the inner ear that help to maintain balance. Structures on the papillae of the tongue that contain chemoreceptors that respond to chemicals dissolved in saliva.
Membranous sac in the vestibule of the inner ear that contains receptors for the sense of balance. Bony chamber of the Aging special senses ear that contains the utricle and the saccule.
Transparent, gellike substance that fills the cavity of the eye behind the lens. The human eyeball is about 0. The rest of the eye is enclosed and protected by a cushion of fat and the walls of the orbit, a cavity in the skull formed by facial and cranial bones.
The eye wall consists of three covering layers: The sclera, the outer layer made of fibrous connective tissueencases and protects the eyeball. The visible portion of the sclera is seen as the "white" of the eye. When that portion is irritated, the small blood vessels contained in the layer enlarge, producing a "bloodshot eye.
The cornea is transparent and has no capillaries. It is the "window" or the first part of the eye through which light enters.
A delicate mucous membrane, the conjunctiva, covers the cornea and visible portion of the sclera. It secretes mucus to lubricate the eyeball and keep it moist.
The choroid is a thin membrane lying underneath the sclera.
It is composed of a dark pigment that absorbs light within the eye preventing glare and numerous blood vessels that nourish the internal tissues of the eye. At the front end of the choroid is the ciliary body. Running like a ring around the visible portion of the eye, the ciliary body connects the choroid with the iris.
The ciliary body contains muscles that are connected by ligaments to the lens behind the iris. The iris is the visible portion of the choroid. It gives the eye its color, which varies depending on the amount of pigment present in the iris.
Dense pigment makes the iris brown, while little pigment makes the iris blue. If there is no pigment the iris is pink, as in the eye of a white rabbit. The rounded opening in the center of the iris is the pupil, through which light passes.
In bright light, muscles in the iris constrict the pupil, reducing the amount of light entering the eye. Conversely, the pupil dilates enlarges in dim light, increasing the amount of light entering.
Extreme fear, head injuries, and certain drugs can also dilate the pupil. The lens is a crystal-clear, oval, flexible body that is biconvex curving outward on both surfaces.
It is made up of approximately 35 percent protein and 65 percent water. The entire surface of the lens is smooth and shiny, contains no blood vessels, and is encased in an elastic membrane. The lens sits behind the iris and focuses light on the retina.
In addition to holding the lens in place, the muscles of the ciliary body contract and relax, causing the lens to either fatten or become thin. As the shape of the lens changes, so does its focus. The retina, the innermost layer of the eye, is thin, delicate, sensory tissue composed of layers of light-sensitive nerve cells.How our senses change with age.
Published: December, Taste and smell, two interdependent senses that aid in the enjoyment of food, become less sharp with aging. While the number of taste buds remains unchanged, reduced flow of saliva may lead to diminished taste.
Receive special offers on health books and reports; Plus, receive. May 31, · Aging ‘Old-Person Smell’ Really Exists, Scientists Say Elderly people have a distinct smell, confirm researchers at Monell Chemical Senses Center in Philadelphia, but contrary to stereotype their scent isn't all bad.
topics in biomedical gerontology Download topics in biomedical gerontology or read online books in PDF, EPUB, Tuebl, and Mobi Format. Protein modifications with aging, special senses, circadian rhythms, and the adrenocortical axis are tacked in the book as well. Gerontologists, psychologists, health care professionals, and graduate students.
Aging changes in the heart and blood vessels (Special Topic) Aging changes in the nervous system (Special Topic) Aging changes in the senses (Special Topic) Aging changes in vital signs (Special Topic) Aging spots - should you be concerned?
(Special Topic) Agitation (Special Topic) Av. AV Block (Condition). While all of the senses are important to good health and well being, vision is one of the most im- Understanding the Effects of Aging • Aging.
A lifetime accumulation of repeated exposures to damaging factors leads to hearing. Age and Driving Safety Tips and Warning Signs for Older Drivers.
For many of us, driving is a key aspect of maintaining our independence as we age.