One rectangular pupil? Different forms of the pupils

Date:

2018-09-05 05:00:22

Views:

865

Rating:

1Like 0Dislike

Share:

Table of contents:

The Pupil – the formation of organs of vision. Without pupils there is no sense to have eyes because it is through these holes light passes into the eye and falls on the retina, consisting of numerous receptors of light and color.

Variety of shapes pupils

Nature has created openings for the passage of light of different shapes. Each type of organisms, the pupil is just such a form, which is the most profitable animal, from the point of view of survival.

So, the human pupils are round. The fact that we need the visibility in all directions equally. A circular pupil is characteristic of hunters and gatherers.

Cats have vertical pupil. Because they are in the hunt, you need to determine the distance to the object of the attack to most accurately to calculate the power jump. The vertical pupil helps. However, tigers, lions and all other large cat pupils are round like humans. Cat's only got a small size of vertical openings. Apparently, the greater height of the body vertical shape of the pupil helps.

One pupil is rectangular? Many mammals have this form.

the pupil of the goat

In the darkness of the hole becomes square. What mammals have a rectangular pupil? Almost all hoofed animals. The fact that herbivorous mammal survival requires a broad overview of the area. Rectangular pupil allows to increase visibility to 340 degrees. Moreover, hoofed animals usually graze the herd. Many eyes constantly looks around the area. What is more interesting is the fact that goat's eyes, for example, can be rotated 50 degrees to maintain the horizontal orientation of the pupil when moving the head. Tilting his head to the grass, eat, eating, goat preserves the horizontal position of the rectangular hole.

Recommended

"Knowledge is light and ignorance is darkness": the value, meaning and alternatives

There are some sayings that would seem to need no explanation, such as “teaching & ndash; light and ignorance – darkness”. But some still do not understand their meaning. But not only for such people is written by our article. I...

What was invented by Mendeleev for the army. The history and fate of the invention

What was invented by Mendeleev for the army. The history and fate of the invention

D. I. Mendeleev was a brilliant Russian scientist-polymath, who made many important discoveries in various fields of science and technology. Many people know that he is the author of “Fundamentals of chemistry" and the periodic law of chem...

The origin of the Slavs. The influence of different cultures

The origin of the Slavs. The influence of different cultures

Slavs (under this name), according to some researchers, appeared in the story only in 6 century ad. However, the language of nationality bears the archaic features of the Indo-European community. This, in turn, suggests that the origin of the Slavs h...

Pupil giraffe

In the school course tests may come across this question: one rectangular pupil? The giraffe or octopus? This question is a trick. You need to think. People may know that goats have rectangular pupils. On the basis of this to conclude that the giraffe, which is also ungulates, the eye holes are rectangular. But his pupils rather oval. The same and have horses. In low light they have the pupil becomes large and round.

Pupil cephalopod mollusk

One of the rectangular pupil? Octopus. Hole his eyes has a strictly rectangular shape.

Another one of the rectangular pupil? The mongooses. Apparently, also for increasing the overview area.

Some cephalopod molluscs given the nature of the intricate shapes of the pupils. They have cuttlefish Crescent-shaped or in the form of the Latin letter “S”.

the pupil of the cuttlefish

Pupils of amphibians and reptiles

The geckos pupil in the contraction of the state is in the form of beads strung on a thread.

the pupil of the Gecko

A Variety of shapes for eye holes are different and amphibians. Our frogs pupils are horizontal. And spadefoot toad-vertical orientation, like a cat. On this basis it is easy to distinguish all the young zoologists. There are amphibians with diamond-shaped pupils. This feature also helps to extend the view of view in all directions.

Origin of the forms of pupils

Consider the example of ungulates. Those who have rectangular pupil in the distant past had round holes eyes. But the constant bright sun causes the muscles to constrict the openings of the pupils. Ungulates need to take care of eyes to maintain good vision and with a weak night light. These mammals are currently developed muscles responsible for horizontal contraction of the pupil. This form allows the most widely studied territory, without turning his head. When the muscle relaxation that occurs when frightened or reduced illumination, the pupils dilate. This increases the delivery of light to the retina.

Thus, after analyzing a variety of animals, the scientists came to the conclusion that the shape of the pupils depend on the ecological specialization of the species. Hunters and gatherers the pupil is round. Hoofed it rectangular. And for hunters ambush better vertical pupil shape.


Article in other languages:

AR: https://tostpost.com/ar/education/6515-one-rectangular-pupil-different-forms-of-the-pupils.html

BE: https://tostpost.com/be/adukacyya/11649-u-kago-prastakutny-zrenka-roznyya-formy-zrenak.html

DE: https://tostpost.com/de/bildung/11651-wer-rechteckige-pupille-verschiedene-formen-der-pupillen.html

ES: https://tostpost.com/es/la-educaci-n/11659-a-quien-rectangular-de-la-pupila-las-diferentes-formas-de-las-pupilas.html

HI: https://tostpost.com/hi/education/6520-one-rectangular-pupil-different-forms-of-the-pupils.html

JA: https://tostpost.com/ja/education/6516-one-rectangular-pupil-different-forms-of-the-pupils.html

KK: https://tostpost.com/kk/b-l-m/11652-k-mnen-t-kb-ryshty-zrachok-r-t-rl-nysandary-arashy-ty.html

PL: https://tostpost.com/pl/edukacja/11646-kto-prostok-tny-ucznia-r-ne-formy-renic.html

PT: https://tostpost.com/pt/educa-o/11641-quem-retangular-pupila-diferentes-formas-de-pupilas.html

TR: https://tostpost.com/tr/e-itim/11654-birisi-dik-a-renci-farkl-form-g-zbebe-i.html

UK: https://tostpost.com/uk/osv-ta/11652-u-kogo-pryamokutniy-z-nicya-r-zn-formi-z-nic.html

ZH: https://tostpost.com/zh/education/7091-one-rectangular-pupil-different-forms-of-the-pupils.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

Comments (0)

This article has no comment, be the first!

Add comment

Related News

Root: the structure of the root. Types of roots (biology)

Root: the structure of the root. Types of roots (biology)

One of the most important parts of the plant is the root. It ensures the normal functioning of trees, herbs, shrubs and even water plants. It often happens that the aboveground part of the plant — is just the tip of the iceb...

Military rank in Imperial Russia. Military rank in the Imperial army

Military rank in Imperial Russia. Military rank in the Imperial army

In this article, we consider some ranks in tsarist Russia. This list is really incomplete, it can continue. We present you only the main ranks.Brigadierlet's Start our list of "Military ranks in the Imperial army of Russia" with t...

Zoospore is a form of life cycle and method of reproduction

Zoospore is a form of life cycle and method of reproduction

after Reading this article, you will be able to use information about the special forms of dispute – the zoospores. We'll tell you why they are so called, will introduce some of their features, functions, and cause.What is z...

Russian researcher Erofey Khabarov. Opened this Explorer?

Russian researcher Erofey Khabarov. Opened this Explorer?

In the TRANS-Baikal region, among the expanses of the taiga, there is a small railway station Yerofey Pavlovich. Not all passengers passing her Express realize that in its title as in the name of one of the largest cities of the F...

Fire prevention in everyday life and organization of protection of population

Fire prevention in everyday life and organization of protection of population

In this article we'll talk about how important fire prevention in everyday life. We will address the many questions about the security at home, at work, on the street. We will try to give a lot of examples of that, for some reason...

The meaning of the idiom

The meaning of the idiom "RUB points", the origin, synonyms, examples

When someone is caught cheating, people are talking differently about the actions of such a person. The meaning of the idiom "bluffing" in this case, it will give the thoughts of the person telling the truth. Consider hi...