cata-, cat-, cath-, kata-
(Greek: down, downward; under, lower; against; entirely, in accordance with, completely; definitely)
2. A mountain lion or "cat of the mountain".
2. A stereotyped and meaningless repetition of words and phrases, as seen in some cases of schizophrenia.
Sometimes, laughter and other emotions trigger a reflex of cataplexy in people which can bring many of the muscles of the body to the point of collapse.
The phenomenon of cataplexy can be measured by sending electric signals through the muscles and gauging their responses. In cataplexy, what is known as the H-reflex, a neurological pathway that causes muscle contractions, virtually disappears.
Cataplexy often happens to people who have narcolepsy, a disorder in which there is great difficulty stayin awake during the daytime.2. Etymology: from Greek kata, "down" + plexis,"a stroke, a seizure," or "a falling-down seizure".
Cataracts usually occur in both eyes; however, in most cases one eye is more severely affected than the other eye.
Most people over the age of 65 have some degree of cataracts; but, usually the opacification is minor and it is often confined to the edges of the lens, or lenses, where it doesn't interfere with vision.
The term cataract came many centuries ago from the idea that the whiteness behind the pupil, or lens, was a kind of waterfall descending from the brain.
In fact, the appearance of the whiteness is a result of the changes in the delicate protein fibers within the lens in a way that is similar to what occurs in eggs when they are boiled.