Insects breathe through a respiratory system consisting of spiracles, trachea, tracheoles, and air sacs. Air enters through openings called spiracles and travels through a network of tubes called trachea. The trachea branch into finer tracheoles where gas exchange occurs. Air sacs store oxygen and provide buoyancy. The respiratory system delivers oxygen to cells and removes carbon dioxide as a waste product, but is separate from the circulatory system.

1. RESPIRATION SYSTEM
IN
INSECTS
PRESENTED BY : ZAID ASIF

2. WHAT IS
RESPIRATION
???

3. Inhaling of oxygen
&
Exhaling of carbon dioxide

4. RESPIRATION IN INSECT
• An insect's respiratory system is the biological
system with which it introduces respiratory
gases to its interior and performs gas exchange.
• Air enters the respiratory systems of insects
through a series of external openings called
spiracles.

5. FUNCTIONS
1. It is responsible for :
delivering sufficient oxygen to all cells of the
body.
Removing carbon dioxide that is produced as
a waste product of cellular respiration.
2. The respiratory system of insects is separate
from the circulatory system.
3. Respiratory systems of insects are developed
from ectoderm

6. RESPIRATORY SYSTEM CONSISTS OF;
• SPIRACLES
• TRACHAE
• TRACHEOLES
• TRACHEAOBLAST
• AIR SACS

7. SPIRACLES
• Air enters into the body through tiny holes
are spiracles.
• Use to avoid water loss.
• Air passage is controlled by VALVES.
• Insects have about ten pairs of opening,
called spiracles in their exoskeleton.
• Controlled by central nervous system

9. TRACHEA
• The tracheae are the larger tubes of the tracheal
system.
• Ectodermal in origin
• Cuticular pipe like apparatus.
• Give Flexibility.
• Never become intracellular

11. TRACHEOLES
• The small network of tracheae.
• Diameter less than 1µm (0.2 µm – 0.3 µm)
• Gaseous exchange occurs across tracheole
• It can be intracellular.

13. TRACHEOBLAST
• The branches of tracheae, ends in
polygonal cells.
• Consists of cytoplasm and nucleolus.

15. AIR-SACS
• Balloon like structure acts as oxygen reservoir.
• Provide buoyancy to flying in aquatic insects.
• Allow growth of body.
• In dry environment, air-sacs allow an insect to
conserve water by closing its spiracles.
• Heat insulation & maintain body temperature.

17. CONCLUSION
• Instead of lungs, insects breathe with a network
of tiny tubes called tracheae.
• Air enters in the tubes through a row of holes
along an insect's abdomen.
• The air then diffuses down the blind-ended
tracheae.
• Since the biggest bugs have the longest tracheae,
they should need the most oxygen to be able
to breathe.