ANATOMY

Detailed explanation-1: -Some insects, including grasshoppers, have air sacs that are enlarged tracheae lacking the normal exocuticle and taenidia and are hypothesized to act as bellows to aid convective airflow (for review see Refs.

Detailed explanation-2: -Instead of nostrils, insects breathe through openings in the thorax and abdomen called spiracles.

Detailed explanation-3: -Instead of lungs, insects breathe with a network of tiny tubes called tracheae. Air enters 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.

Detailed explanation-4: -Insects don’t have lungs and their “blood” doesn’t carry oxygen. Insect cells get oxygen via a direct link to the air outside-a network of tubes, called tracheae let oxygen reach cells deep within the insect.

Detailed explanation-5: -Air sacs are found as tiny sacs off the larger breathing tubes (tracheae) of insects, as extensions of the lungs in birds, and as end organs in the lungs of certain other vertebrates. They serve to increase respiratory efficiency by providing a large surface area for gas exchange.