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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.
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 ...
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.
Branchial hearts are accessory pumps that supplement the action of the systemic heart in a cephalopod's body. They are myogenic in nature. [1] Branchial hearts are always in pairs located at the base of the gills. Each branchial heart consists of a single chamber. [1] [2] They pump blood through the gills via the afferent branchial veins.
The anus is also on the right side of the body, so that waste matter is efficiently carried away. Bipectinate gills have to be supported by membranes, and these can become fouled with debris and sediment, restricting such gastropods to relatively clean-water environments, such as water flowing over solid rock.
An insect uses its digestive system to extract nutrients and other substances from the food it consumes. [3]Most of this food is ingested in the form of macromolecules and other complex substances (such as proteins, polysaccharides, fats, and nucleic acids) which must be broken down by catabolic reactions into smaller molecules (i.e. amino acids, simple sugars, etc.) before being used by cells ...
Discover the 15 animals that look like, or share similar behaviors with, a raccoon — including olinguitos, raccoon dogs, and more.
The spiracle is often located towards the top of the animal allowing breathing even while the animal is mostly buried under sediments. [5] As sharks adapted a faster moving lifestyle some became obligate ram ventilators , breathing exclusively by forcing water through their gills by swimming; among these are requiem sharks and hammerhead sharks ...