Dictionary » C » Cones



The bark of Holarrhena antidysenterica (family Apocynaceae), an indian tree; used as an astringent and in the treatment of dysentery and amoebiasis.

Synonym: kurchi bark.

Origin: E. Ind.

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Re: About how many megapixels would human eye hold?

"The average human retina has five million cone receptors on it. Since the cones are responsible for color vision, you might suppose that this equates to a five megapixel equivalent for the human eye. But there are also a hundred million rods that detect monochrome ...

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by hymenoptera7
Tue Jun 25, 2013 2:42 am
Forum: General Discussion
Topic: About how many megapixels would human eye hold?
Replies: 1
Views: 1617

What are some reasons that prove adaptations are not designe

... is much better designed. The tissue form which the vertebrate eye is derived comes from the brain. Therefore, the light sensitive cells (rods and cones) are found behind the nerve cells - i.e., light has to pass through the nerve cells before striking the rods and cones. Also, those nerves have ...

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by thoffnagle
Thu Jan 31, 2013 1:04 am
Forum: Evolution
Topic: What are some reasons that prove adaptations are not designe
Replies: 12
Views: 8493

help match biology

... Of the cerebrum; auditory interpretation; impulses are from the organ Corti Of the cerebrum; visual interpretation; impulses are from rods and cones Involuntary control of heart rate, breathing rate, blood pressure, and swallowing Conscious control; thinking, creative thought, emotions, interpretation ...

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by mkshawty
Wed Apr 25, 2012 11:30 pm
Forum: Human Biology
Topic: help match biology
Replies: 1
Views: 4770

Re: vision in water and air.

... different as water and air should be transparent in the same spectrum. It's a heck of a coincidence. It allows for eye physiology such as rods and cones, to be equally useful in two environments, without needing distinct apparatus, one for vision in water, one for vision while in air.

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by mattw
Sat Oct 01, 2011 11:32 pm
Forum: Evolution
Topic: vision in water and air.
Replies: 5
Views: 3872

UNILATERAL red-green color blindness

... series. Our data suggest that (1) in most (if not all) of the carriers with colour vision impairment, there is no complete lack of normal retina cones, and (2) the proportion of defective retina cones is remarkably similar in both eyes of individual heterozygotes. The latter observation may indicate ...

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by Blacky11
Mon Aug 01, 2011 10:03 am
Forum: Genetics
Topic: UNILATERAL red-green color blindness
Replies: 7
Views: 14500
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