--%>
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 : Nematodes-beings-morphology-kind of

    Explain the characterization of nematodes according to illustrations of representing beings, fundamental morphology, kind of symmetry, germ layers and coelom, respiratory system, digestive system, excretory system, circulatory system, nervous system and kinds of repro

    		•
  • Q : Illustrate Cataract Cataract: This is a

    Cataract: This is a disease of eyes. The lens of the eye will be milky in appearance and the vision gets dimmer and dimmer. The treatment is the elimination of opaque lens by operation.

    		•
  • Q : Turning of embryo from gastrula to

    How does the embryo turn from gastrula to neurula? How is the neural tube made? What is the embryonic origin of nervous system in vertebrates?

    		•
  • Q : Illustrate water is a polar or a

    Illustrate water is a polar or a non-polar molecule? What is the effect of that characteristic for the function of water as a solvent?

    		•
  • Q : Foreign Market What are the feasable

    What are the feasable reasons to enter the foreign market?

    		•
  • Q : Explanation of pentoses Give a brief

    Give a brief explanation of pentoses? To which organic group do pentoses belong? Are nucleotides formed of only one form of the pentose?

    		•
  • Q : Trait Studies-Theories of Leadership

    Trait Studies-Theories of Leadership: A) The "great man" approach B) Traits are distinguishing personal characteristics of a leader such as intelligence, values, appearance, etc

    		•
  • Q : Cheap location to take my pet Is there

    Is there a cheap location to take my pet (for health care)?

    		•
  • Q : Steps in the planning Steps in the

    Steps in the planning Perception of opportunities: Perception of opportunities is not strictly a planning process. However, this awareness is very i

    		•
  • Q : From which germ layer do blood cells

    From which germ layer do blood cells initiate? What are other organs as well as tissues made from that germ layer?

    		•