Insects are so unlike humans. Their embryonic development proceeds with transformations, they have an external, not an internal skeleton, their circulatory and central nervous systems differ. Even insects breathe quite differently from mammals.
Instructions
Step 1
There is only one trachea in the human body. Through it, air entering through the upper respiratory tract is transported to the lungs. Insects lack a nose, lungs and bronchi, their blood, unlike the blood of mammals, does not carry oxygen throughout the body. Insects breathe exclusively with the help of tracheas, the number of which in their body exceeds the number in mammals and can vary from one to two to eight to ten pairs.
Step 2
The respiratory system of insects is represented by many tracheas that permeate their body. Insect tracheas are tubules that open outward with spiracular orifices. In the depths of the body, the trachea branch into smaller tubes - tracheoles. Tracheoli encircle all organs, delivering oxygen to the places of its consumption.
Step 3
Insects living in the aquatic environment have closed-type spiracles, since they receive oxygen from water, in terrestrial insects - open-type spiracles. However, even the latter can, if necessary, regulate their work. For example, if a terrestrial insect gets into the water, it will be able to live without air for some time, closing its spiracles.
Step 4
Over time, insects have developed various adaptations to improve the efficiency of the respiration process. For example, well-flying insects have air sacs where oxygen can be stored. And some larvae have developed the ability for cutaneous respiration.
