The organs of respiration are different in different organisms.
A. Tracheae :
1. Respiration that take place via tracheae is called Tracheal respiration.
2. This is present in all insects. In this system there are openings called spiracles which enter the body of the insect through a network of air tubes called Tracheae.
3. The tracheae reach all parts of the body and help in the exchange of gases.
4.
Ex : Grasshopper, Cockroach, Honey bee etc.
B. Skin :
Cutaneous respiration :
1. In some animals the skin is moist and slimy with mucus which helps in breathing through the skin.
Ex : Earthworm.
2. Frogs have lungs for breathing which they use when they are on land.
3. But can breathe through the skin which is moist and slippery while in water.
C. Gills:
Branchial respiration :
1. Gills are seen in fishes. Gills are present beneath membranous covers on either side of the head.
2. The gills have a rich supply of blood, for exchange of oxygen and carbon dioxide.
3. Fish take in water through their mouth which passes out over the gills, the specialized organs to absorb the dissolved oxygen present in the water.
D. Lungs:
1. Respiration through lungs is called Pulmonary respiration.
2. In all land animals and some water animals the organs for breathing are lungs.
3. They are meant for taking oxygen from the air.
Ex :
Cow, dog, whale, humans etc.
