What is the function of the iris and of the pupil, Biology

Assignment Help:

What is the function of the iris and of the pupil?

The iris works like the diaphragm of a photographic camera as it has muscles that contract or relax varying the pupil diameter. When the luminous intensity heightens the parasympathetic nervous system commands the contraction of the pupil; when there is shortage of light the sympathetic nervous system stimulates the dilation of the pupils. These movements depend upon the muscles of the iris.

 


Related Discussions:- What is the function of the iris and of the pupil

Effect of air pollution, (i)    Effect on Human Health: Air pollution...

(i)    Effect on Human Health: Air pollution causes many respiratory problems in human being. (1)   Dust, soot and smog causes several respiratory troubles such as bronc

Nature defences against viral infections, Nature defences against viral inf...

Nature defences against viral infections 1.      Interferons - In 1957 Issue and Lindenmann discovered that vertebrate cells infected with viruses, produce a diffusible antiv

Describe cytokinesis in a plant cell, Describe cytokinesis in a plant cell....

Describe cytokinesis in a plant cell. Vesicles produced by the Golgi apparatus fuse at  the midline of the cell to form the cell plate, a  cell wall that elongates to divide th

Normal color vision- color blindness, If a color blind man marries a woman ...

If a color blind man marries a woman pure for normal color vision, it's probable that one of the below situations may result. Is it possible that a) All the children would be

Issues impacting health and development -inefficiency, Normal 0 ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Calorific value, Calorific value is one of the most important characteristi...

Calorific value is one of the most important characteristics of a fuel. It judges the efficiency of fuel. Calorific value is defined as "the total quantity of heat liberated, wh

Antiparkinsonian drugs, Antiparkinsmian Drugs: Antiparkinsonian drugs ...

Antiparkinsmian Drugs: Antiparkinsonian drugs are  the  specific drugs  to treat the extrapynnidal side effects  of  antipsychotic agents.  Anticholinergic drugs  block

Management of gout, Q. Management of Gout? The goals of therapy or mana...

Q. Management of Gout? The goals of therapy or management of gout is based on the following aspects: • early resolution of inflammation, • prevention of recurrent attac

Explain the term - muscle contraction headache, Explain the term - Muscle C...

Explain the term - Muscle Contraction Headache This is one of the most common headaches. It is also known as tension or nervous headaches. They result from sustained contractio

#title.Homework., Why do you think it is necessary for physicians to have s...

Why do you think it is necessary for physicians to have so many different terms that describe fractures (compound, comminuted, transverse, greenstick, etc.)?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd