Explain the function of the pupil and of the iris, Biology

Assignment Help:

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

The iris works like the diaphragm of a photographic camera since it has muscles that relax or contract 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:- Explain the function of the pupil and of the iris

Impediments to infuse biology - lack of trained people, Define Impediments ...

Define Impediments to infuse biology - Lack of trained people? At present, biologists as a rule have not been trained sufficiently in quantitative approaches. A heavy dose of m

Copulation, COPUL A TIO N - Followed with the help of penis. Sperms ...

COPUL A TIO N - Followed with the help of penis. Sperms are ejaculated deep in vagina. Polyestrous i.e. can capulate any time thorughout the year.

What is the genetic disease in which this factor is absent, What is factor ...

What is factor VIII? What is the genetic disease in which this factor is absent? Factor VIII has the function of activating factor X that in its turn is essential for the trans

Explain delayed loading implant exposure, Q. Explain Delayed Loading Implan...

Q. Explain Delayed Loading Implant Exposure? The philosophy that has been described has its main objectives in the predictable achievement of osseointegration and the creation

Transpiration, Most of the water taken up by a plant passes through it and ...

Most of the water taken up by a plant passes through it and is evaporated to the atmosphere.What use is made of the tiny fraction of this water which is retained by the plant?

What do you mean by pelvic girdle, What do you mean by Pelvic Girdle? B...

What do you mean by Pelvic Girdle? Bones in vertebrates which connect the appendages on left and right side of the posterior appendicular skeleton to each other. Pelvic girdles

Developmental biology, a sea urchin egg is injected with an mRNA encoding t...

a sea urchin egg is injected with an mRNA encoding the cadherin protein fragment described above and an mRNA encoding the Pmar1 transcription factor. The embryo is allowed to devel

TISSUES, WHY BLOOD IS CALLED FLUID CONNECTIVE TISSUE

WHY BLOOD IS CALLED FLUID CONNECTIVE TISSUE

What do you mean by endemic goiter, Q. What is a goiter? What is endemic go...

Q. What is a goiter? What is endemic goiter? How this problem is socially solved? Goiter is the abnormal enlargement of the thyroid gland the goiter appears as a tumor in the a

VIRUSES, ARE VIRUSES CELLULAR ORGANISMS?

ARE VIRUSES CELLULAR ORGANISMS?

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