Your SlideShare is downloading. ×
Nose
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Saving this for later?

Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime - even offline.

Text the download link to your phone

Standard text messaging rates apply

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

  • Be the first to like this

No Downloads
Views
Total Views
223
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
8
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Fatima Fareesa siddiquiRoll no 51Biological sciences
  • 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. . We can neither smell not taste substance which are not soluble in water
  • 4. Thereceptorswhich aresensitive totaste andsmell arecalled asCHEMORECEPTORS
  • 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. Smell isdetectedby twopatches ofreceptorcellspresent inthe nose
  • 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.  Mucous membrane secretes mucous and keeps the membrane moist. Also have several types of chemoreceptor cells(Olfactory receptors)
  • 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. Thesechemicals aredetectedby theolfactoryreceptors.
  • 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.  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.  Brain has a separate centre to analyse information about sense of smelling