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

Define role in growth and cellular differentiation, Define Role in growth a...

Define Role in growth and cellular Differentiation? The growth and differentiation of epithelial cells throughout the body are especially affected by vitamin A deficiency.  In

What is packaging, Q. What is packaging? What is packaging? Packaging...

Q. What is packaging? What is packaging? Packaging means a coordinated system of preparation of goods (in this case, foods) for shipment, distribution, storage and

Microorganisms on on basis of nutrient degradation capacity, Q. Microorgani...

Q. Microorganisms on On basis of nutrient degradation capacity? On basis of nutrient degradation capacity: - Proteolytic: Microorganisms, which are capable of protein degra

The human impact on the environment, what are the principle sources of exce...

what are the principle sources of excessive nitrate and phosphate in rivers and lakes?

Radioisotope diagnostic procedures, RADIOISOTOPE DIAGNOSTIC PROCEDURE: ...

RADIOISOTOPE DIAGNOSTIC PROCEDURE: Radioisotope diagnostic procedures include perfusion, ventilation  and gallium scan. Perfusion Lung Scan Following  injection of a radio

Proximal end of his right femur, In Reggie's case, he fractured the proxima...

In Reggie's case, he fractured the proximal end of his right femur, an integral component of his hip. Name the joint disorders that Reggie is more a risk of in (a) the short term a

Process of regeneration in planarians, Process of Regeneration in Planarian...

Process of Regeneration in Planarians Regeneration in planarians has been broadly studied and considerable information regarding this phenomenon is now available. Let us see w

Aortic valve replacement-types of surgery in ar, Aortic Valve Repla...

Aortic Valve Replacement :  Technique: Surgical technique is not much different from what has already been described for aortic stenosis. Care must be taken to avoid VF

Explain advantages and disadvantages of spread plate method, Explain Advant...

Explain Advantages and Disadvantages of Spread Plate Method? The advantages and disadvantages of spread plate method are highlighted next. Advantages   1. It is useful fo

Open and closed type of circulatory systems, Open and Closed Type of Circul...

Open and Closed Type of Circulatory Systems There are two categories of circulatory system found in higher metazoans. In one type the original blastocoel carries on to be the

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