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Insects have spiracles on their exoskeletons to allow air to enter the trachea. [1] [page needed] In insects, the tracheal tubes primarily deliver oxygen directly into the insects' tissues. The spiracles can be opened and closed in an efficient manner to reduce water loss. This is done by contracting closer muscles surrounding the spiracle.
The forelegs are reduced in the Nymphalidae Diagram of an insect leg. The thorax, which develops from segments 2, 3, and 4 of the larva, consists of three invisibly divided segments, namely prothorax, metathorax, and mesothorax. [11] The organs of insect locomotion – the legs and wings – are borne on the thorax.
Although all insects have spiracles, only some arachnids have them. Some spiders such as orb weavers and wolf spiders have spiracles. Ancestrally, spiders have book lungs, not trachea. However, some spiders evolved a tracheal system independently of the tracheal system in insects, which includes independent evolution of the spiracles as well ...
Depending on the number and position of the tracheal spiracles, the following types of breathing apparatus can be distinguished. apneustic, with absence of stigmas ; metapneustic, with only one pair of stigmata. These are on the abdomen. amphipneustic, with two pairs of stigmas. On pair on the prothorax, one pair on the abdomen.
The trachea (pl.: tracheae or tracheas), also known as the windpipe, is a cartilaginous tube that connects the larynx to the bronchi of the lungs, allowing the passage of air, and so is present in almost all animals lungs. The trachea extends from the larynx and branches into the two primary bronchi.
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The harmonics are produced by collisions of the vocal folds with themselves, by recirculation of some of the air back through the trachea, or both. [31] Some singers can isolate some of those harmonics in a way that is perceived as singing in more than one pitch at the same time—a technique called overtone singing or throat singing such as in ...
Get ready for all of today's NYT 'Connections’ hints and answers for #582 on Monday, January 13, 2025. Today's NYT Connections puzzle for Monday, January 13, 2025The New York Times.