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

Oxidation of enzymes action, Oxidation Some enzymes which have the sulf...

Oxidation Some enzymes which have the sulfhydryl (-SH)  group in  the catalytic site are very sensitive to oxidation. Due  to oxidation of  the  -SH  group  by  aerial  oxygen

Discuss chemical examination of semen, Question 1 Discuss briefly the c...

Question 1 Discuss briefly the collection and examination of pericardial fluid Question 2 Discuss the following- A) Collection of CSF B) Physical examination o

Chromosomal type-genetic basis of sex determination, Chromosomal Type-Genet...

Chromosomal Type-Genetic basis of Sex Determination It refers to the condition where the genes involvcd in sex dcterrnincltion arc located on specific chromosomes known as the se

Mechanisms of hemorrhage contention, Q. What are the mechanisms of hemorrha...

Q. What are the mechanisms of hemorrhage contention called? The physiological mechanisms of hemorrhage contention one of them is blood clotting are generically named hemostatic

Genetics, GENETICS 1.         The branch genetics started in 1900 after...

GENETICS 1.         The branch genetics started in 1900 after rediscovery of Mendel's work. 2.         Gregor Johann Mendel is called Father of genetics. 3.         The t

Determine the important neuropathic symptoms, The following are the importa...

The following are the important neuropathic symptoms: 1. Dysesthesia: It means burning or tingling sensation, sunburn like feeling etc. Take a note of duration, time of occurre

Function of amino acids, FUNCTIO N OF AMINO ACIDS Proteins are poly...

FUNCTIO N OF AMINO ACIDS Proteins are polymers of amino acids. Glycine form porphyrin nucleus in chlorophyll and heme (= haem) proteins like haemoglobin and cytochrome

Modes of respiration, Modes of Respiration Many small organisms obtain...

Modes of Respiration Many small organisms obtain oxygen by diffusion through their body surfaces. They do not have any specialised respiratory organs nor do they have blood ci

Causes of diabetic ketoacidosis, Q. Causes of Diabetic Ketoacidosis? Th...

Q. Causes of Diabetic Ketoacidosis? The causes of Diabetic Ketoacidosis (DKA) are the following: - Missing of insulin injection - Infection - Trauma (injury) - Myoc

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