--%>
Assignment Help - homework help

Function of the iris and pupil

Describe the function of the iris and pupil?

E

Expert

Verified

The iris works similar to the diaphragm of a photographic camera as it has muscles which contract or relax differing the pupil diameter. Whenever the luminous intensity heightens the parasympathetic nervous system commands the contraction of pupil; whenever there is shortage of light, sympathetic nervous system stimulates the dilation of pupils. Such movements depend on the muscles of the iris.

   Related Questions in Biology

  • Q : Disadvantages of Equity Motivation -

    1)     Is a given factor and input or an outcome? For example, "responsibility" is viewed by some as input and as output by others. 2)     How does a person choose (or change) the comparison other? 3)     Under what circu

    		•
  • Q : What do you mean by Production Lead Time

    Production Lead Time: It is the time interval between the placement of a contract and receipt into supply system of materiel bought. Two entries are given: (i) Initial--The time interval when the item is not under production as of the date of contract

    		•
  • Q : Path tracked by energy absorbed by

    What is the path tracked by the energy absorbed by plants to be utilized in photosynthesis?

    		•
  • Q : Kinds of passive transport What are the

    What are the three major kinds of passive transport?

    		•
  • Q : Calcium can interfere with drugs I have

    I have listened to calcium can interfere with recommendation drugs?

    		•
  • Q : Anatomical reason for left bronchus to

    Describe the anatomical reason for the left bronchus to be much elevated than the right bronchus? Why in many cases of aspiration of foreign material through children is the object found in the right bronchus?

    		•
  • Q : Spinal cord section at cervical

    How is it described that a person with spinal cord sectioned at cervical level is still capable to carry out the patellar reflex?

    		•
  • Q : External Communication - Organization

    Unlike internal communication, external communication flows outward, it addresses people outside the organization, like the prospective customers, competitors, public, press, media and the government. External communication can take place in various ways and through different channels. Letters, n

    		•
  • Q : Explain type second hypersensitivity

    Explain the term type II hypersensitivity in short?

    		•
  • Q : Describe Process Breakdown Structure or

    Process Breakdown Structure (PBS):A) Process-oriented projects: outcome is a series of steps or phases, rather an identifiably tangible item not suited to WBS definition B) A PBS example (i.e. software pr

    		•