--%>
Assignment Help - homework help

Function of iris and pupil

State some of the function of iris and of the pupil?

E

Expert

Verified

The iris works just like diaphragm of photographic camera since it has muscles which contract or relax varying the pupil diameter. Whenever, the luminous intensity heightens parasympathetic nervous system controls the contraction of pupil; whenever there exist shortage of the light sympathetic nervous system stimulates the dilation of pupils. These movements depend on muscles of the iris.

   Related Questions in Biology

  • Q : Chordate characterization According to

    According to examples of representing beings, how are Chordate characterized fundamental morphology, kind of symmetry, germ layers and coelom, respiratory system, digestive system, excretory system, circulatory system, nervous system and kinds of reproduction?

    		•
  • Q : Number of chromosomes in human normal

    What number of chromosomes does a human normal haploid cell include? And how many chromosomes does a human normal diploid cell include? And also state the sex chromosomes in each of them?

    		•
  • Q : Ingredients/Element of Communication -

    1)     Source:  the source is the originator of the idea or the message. It may also be known as the sender who may be an individual or a group though, ultimately, it is an individual who might be acting the role on behalf of a group. The source conceives

    		•
  • Q : Problems of Communication -

    I.            Distortion of message. II.           Delays in transmission. III.          Overload or unload message. IV.&nb

    		•
  • Q : Description of zymogens Give a brief

    Give a brief description of zymogens?

    		•
  • Q : Respiration in the phyla of animal

    Beings from four phyla of animal kingdom “breath” through the diffusion. Explain which are those phyla? How this type of respiration is associated to the features present in those animals?

    		•
  • Q : Explain Client-Server Architecture

    Client-Server Architecture: It is network architecture in which each and every computer or process on the network is either a client or a server. The Servers are powerful computers or processes devoted to managing disk drives (that is, file servers),

    		•
  • Q : Name the device for counting RBC Name

    Name the device which is utilized for counting RBC? Answer: Haemocytometer is a device utilized for counting the red blood cells per millimeter of blood.

    		•
  • Q : Pressure modification within the ear

    Why is there a sense of pressure modification within the ear whenever someone goes down the mountain?

    		•
  • Q : Concepts of resting potential-Action

    How different are the concepts of the resting potential, action potential and excitation threshold concerning neurons?

    		•