Fatima Fareesa siddiquiRoll no 51Biological sciences
Nose Smell and taste are chemical senses Sound and taste are physical sense Both smell and taste depend on the chemical ...
.    We can    neither smell    not taste    substance    which are    not soluble    in water
Thereceptorswhich aresensitive totaste andsmell arecalled asCHEMORECEPTORS
 In air breathing vertebrates, receptors for smell and taste are physically separated. Smell receptors are present in no...
Smell isdetectedby twopatches ofreceptorcellspresent inthe nose
 Nose has a long narrow cavity 1. Upper nasal cavity 2.Lower vestibular cavities Nasal cavity is lined with Mucous membr...
 Mucous membrane secretes mucous and keeps the membrane moist. Also have several types of chemoreceptor cells(Olfactory ...
 They have cilia which project into  nasal cavity and responsible for  smelling. When air enters nose, chemicals  presen...
Thesechemicals aredetectedby theolfactoryreceptors.
 Nerve fibres present at the base of each receptor passes through the holes present on the plate. The plate separates th...
 Nerve fibres join to form a large nerve called as Olfactory nerve. Whenever a chemical substance is detected, receptors...
 Brain has a separate centre to analyse information about sense of smelling
Nose
Nose
Nose
Upcoming SlideShare
Loading in …5
×

Nose

390 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
390
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
8
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Nose

  1. 1. Fatima Fareesa siddiquiRoll no 51Biological sciences
  2. 2. Nose Smell and taste are chemical senses Sound and taste are physical sense Both smell and taste depend on the chemical nature of the substance.
  3. 3. . We can neither smell not taste substance which are not soluble in water
  4. 4. Thereceptorswhich aresensitive totaste andsmell arecalled asCHEMORECEPTORS
  5. 5.  In air breathing vertebrates, receptors for smell and taste are physically separated. Smell receptors are present in nose and taste receptors in mouth
  6. 6. Smell isdetectedby twopatches ofreceptorcellspresent inthe nose
  7. 7.  Nose has a long narrow cavity 1. Upper nasal cavity 2.Lower vestibular cavities Nasal cavity is lined with Mucous membrane. Supplied with large no. of blood vessels
  8. 8.  Mucous membrane secretes mucous and keeps the membrane moist. Also have several types of chemoreceptor cells(Olfactory receptors)
  9. 9.  They have cilia which project into nasal cavity and responsible for smelling. When air enters nose, chemicals present in the air dissolve in the moisture.
  10. 10. Thesechemicals aredetectedby theolfactoryreceptors.
  11. 11.  Nerve fibres present at the base of each receptor passes through the holes present on the plate. The plate separates the cavity from the rest of the skull.
  12. 12.  Nerve fibres join to form a large nerve called as Olfactory nerve. Whenever a chemical substance is detected, receptors give a electrical signal which is carried to the brain by the Olfactory nerve.
  13. 13.  Brain has a separate centre to analyse information about sense of smelling

×