The respiratory system allows for the exchange of gases between the atmosphere, blood, and cells. It consists of an upper respiratory tract located outside the chest cavity, including the nose, pharynx, and larynx, and a lower respiratory tract located inside the chest cavity, including the trachea, bronchi, bronchioles, and lungs. The nose is the first organ of the respiratory system and consists of external and internal portions, with the internal portion being a large nasal cavity lined with ciliated epithelium and goblet cells that secrete mucus. The nose functions to filter, clean, and humidify air while facilitating gas exchange and the sense of smell.

1. RESPIRATORY
SYSTEM

2. Table of Contents
RESPIRATION
RESPIRATORY TRACTS
NOSE AND NASAL
CAVITY
01
02
03

3. RESPIRATION
Respiration is the exchange of
gases which occurs between the
atmosphere , blood , and cells.
In this process , oxygen is inhale
(taken inside ) and carbon dioxide
is exhaled ( expelled out )

4. RESPIRATION IS OF TWO WAYS
EXTERNAL RESPIRATION INTERNAL RESPIRATION

5. RESPIRATORY TRACTS
UPPER RESPIRATORY
TRACT
Located outside the chest cavity
LOWER RESPIRATORY
TRACT
Located inside the chest cavity
Include :Nose Pharynx larynx
Include : Trachea , Two Bronchi, Bronchioles ,Two Lungs

6. NOSE AND NASAL CAVITY
Nose is the first respiratory organs
Nose has two portions :
EXTERNAL
PORTION
INTERNAL
PORTION
 Made up of bone and
hyaline cartilage
 Covered with skin
 Flexible
 Has two opening
called nostrils or
external nares
 Large cavity
 Lies over the roof
of mouth

7.  LINING OF THE NOSE
• Inside nose is lined with mucous membrane
• Mucous membrane made up of pseudo
stratified ciliated columnar epithelium .
• Rich in goblet cells which secrete mucus .
 OPENING INTO NASAL CAVITY
Anterior nostrils are opening from external environment into nasal
cavity
Hairs are present which filter the air .
Posterior nostrils are the openings from nasal cavity into the
pharynx

8. PARANASAL SINUSES
 FUNCTIONS OF NOSE
 Filtering
 Cleaning of air
 Exchange of gases
 Olfactory function
 Humidification
Sinus : hollow spaces
Paranasal sinuses are a group of four paired air-filled spaces that surround the nasal
cavity.
1.FRONTAL SINUS
2.ETHMOID SINUS
3.MAXILLARY SINUS
4.SPHENOID SINUS

9. THANK YOU !