eyes in Biological Definition

Albinism

... albinos) generally have flax-white hair, blue eyes and pale white skin which makes them stand out. ... albinism in horses. White horses lack the pink eyes that make a true albino. Bristol Zoo was the ... were white like wool, as white as snow, and His eyes like a flame of fire* Albino frogs ...

Eye

... Diagram of a human eye. Note that not all eyes have the same anatomy as a human eye. An eye ... found in a variety of creatures. The simplest eyes do nothing but detect whether the surroundings are light or dark. More complex eyes are used to provide the sense of vision . ...

Proprioception

... of sight to maintain balance; they would be unable to walk with their eyes closed. Contents showTocToggle("show","hide") 1 Basis ... sobriety test where the subject is required to touch his nose with his eyes closed. People with normal proprioception may make an error of no more ...

Charles Darwin

... Principles of Geology postulating gradual processes over huge periods of time, Darwin wrote home that he was ' seeing' land-forms as if he had the eyes of Lyell . He discovered fossils of gigantic extinct South American Megatheriums and Armadillos in strata which showed no signs of catastrophy ...

Chromosome

... syndrome (extra chromosome 21). This is also known as mongolism or trisomy 21 . Symptoms are decreased muscle tone, asymmetrical skull, slanting eyes and mental retardation. Edward's syndrome is the second most common trisomy after Down's Syndrome. It is a trisomy of chromosome 18. Symptoms ...

Convergent evolution

... of the wings of insects , birds , and bats . All three serve the same function and are similar in structure, but each evolved independently. eyes also evolved independently in various animals. Convergent evolution is a different phenomenon than evolutionary relay and parallel evolution . ...

Ebola

... and a fever for more than 72 hours and less than three weeks. The patient also may have unexplained bleeding from the mucous membranes , skin , eyes , or gastrointestinal tract . The patient may also be going into shock (has a systolic blood pressure of less than 90 mm Hg or a rapid weak ...

Warm-blooded

... Tuna and swordfish dive deep into the ocean, down to where the water is quite cold. Swordfish are able to raise the temperature of their brains and eyes in cold water, allowing for faster eye movements when hunting. Tuna are able to warm their entire bodies through a heat exchange mechanism called the ...

Homunculus

... them, projected on the screen. How is this done? A simple theory might propose that the light from the screen forms an image on the retinas in the eyes and something in the brain looks at these as if they are the screen. The Homunculus Argument shows this is not a full explanation because all that ...

Convergent evolution

... of the wings of insects , birds , and bats . All three serve the same function and are similar in structure, but each evolved independently. eyes also evolved independently in various animals. Convergent evolution is a different phenomenon than evolutionary relay and parallel evolution . ...

Marine biology

... anatomy includes two chamber heart , operculum , secretory cells that produce mucous , swim bladder , scales , fins , gills , lips and eyes . Fish breathe under water by extracting oxygen from sea water through their gills. Fins are used to propel and stabilize them in their watery ...

Marfan syndrome

... Marfan syndrome is a connective tissue disorder, affecting many structures, including the skeleton , lungs , eyes , heart and blood vessels . It is named for the French pediatrician Antoine Marfan , who first described it in 1896 . The disease is ...

Muscle

... is the "unconscious" awareness of where the various regions of the body are located at any one time. This can be demonstrated by anyone closing their eyes and waving their hand around. Assuming proper proprioceptive function, at no time will the person lose awareness of where the hand actually is, even ...

Patau syndrome

... aberration, a disease in which a patient has an additional chromosome 13 . Patau syndrome is associated with severe mental retardation , small eyes that may exhibit a split in the iris ( coloboma ), a cleft lip and/or palate , weak muscle tone (hypotonia), an increased risk of heart ...

Pigment

... with multilayer structures. Unlike structural color, pigment color is the same for all viewing angles. Nearly all types of cells, such as skin , eyes , fur and hair contain pigment. Butterfly wings typically contain structural color, although many of them contain pigment as well. Creatures ...

Yellow fever

... symptoms that arise are fever, muscle aches, headache and backache. Other symptoms may include a red tongue, flushed face, and reddening of the eyes may also be symptoms of the disease. In a proportion of cases there is also involvement of internal organs - liver, kidneys and the heart. There may ...

Vestibular system

... 0.1 Hz and 10 Hz, the deflection of the cupula is approximately proportional to the head-velocity (!). This is very useful, since the velocity of the eyes must be opposite to the velocity of the head in order to have clear vision. Central Processing Signals from the vestibular system also project ...