The respiratory tract extends from the nostrils to the alveoli. It includes the nostrils, nasal cavity, trachea, bronchi and bronchioles. The alveoli are delicate air sacs where the exchange of gases takes place and are surrounded by capillaries. Together, these structures form the pathway that allows for the intake of oxygen and removal of carbon dioxide from the body.

1. BY
VIDYA BALACHANDRAN
Natural Science
KUTEC Dharmasala

3. The respiratory tract is the pathway
which extends from the external
nostrils to the internal alveoli.

4. • An opening through which air
passes in and out of the body.
• External opening of the nose.

5. • Cavity which connects nostrils
with the pharynx.
• It’s wall is lined with mucus and
small hairs.

7. • A long tube strengthened by ‘C’
shaped
• cartilaginous rings.
• Cartilaginous rings help trachea to
remain
• open always.

9. • Branches of trachea which enters th
lungs, supported by cartilaginous
bronchial rings.

10. • The terminal branches of bronchi
that open to the alveoli.
• There are no cartilaginous rings
in the bronchioles.

11. • Delicate air sacs, elastic in nature,
seen at the tip of bronchioles.
• These air sacs are surrounded by a
large number of capillaries.
• The exchange of gases takes place
here.

13. • Double layered protective
membrane of the lungs.
• Pleural fluid seen in between the
membraneous layers prevents
friction between lungs and walls of
the thoracic cavity.

14. • The muscular wall that separate
thoracic
and abdominal cavities.

16. Human respiratory system
consists of
nostrils, nasal cavity, trachea,
bronchus,
bronchioles and alveoli.