Search results
Results from the WOW.Com Content Network
Dorsal ocelli ubiquitously have massive convergence ratios from first-order (photoreceptor) to second-order neurons. [ clarification needed ] These two factors have led to the conclusion that, with some exceptions in predatory insects, the ocelli are incapable of perceiving proper images and are thus solely suitable for light-metering functions.
At the end of each tracheal branch, a special cell provides a thin, moist interface for the exchange of gases between atmospheric air and a living cell. Oxygen in the tracheal tube first dissolves in the liquid of the tracheole and then diffuses across the cell membrane into the cytoplasm of an adjacent cell. At the same time, carbon dioxide ...
Drawing of dorsal view of an adult female P. pensylvanica (Plate VI, figure 3), as well as views of body parts of the species, and drawings of other species. From 1917 Memoirs of the American Entomological Society , with keys to P. pensylvanica figures on pages 278–280.
The posterior portion of the remigium is sometimes called the clavus; the two other posterior fields are the anal and jugal areas. [ 1 ] : 41–42 When the vannal fold has the usual position anterior to the group of anal veins, the remigium contains the costal, subcostal, radial, medial, cubital, and postcubital veins.
Immature cockroaches resemble adults except they are wingless. The cockroach is divided into three sections; the body is flattened and broadly oval, with a shield-like pronotum covering its head. A pronotum is a plate-like structure that covers all or part of the dorsal surface of the thorax of certain insects.
A cockroach's cells divide only once each molting cycle (which is weekly, for the juvenile German cockroach [68]). Since not all cockroaches would be molting at the same time, many would be unaffected by an acute burst of radiation, although lingering and more [ clarification needed ] acute radiation would still be harmful.
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 ...
The desert cockroach can gain weight by absorption of water vapor from unsaturated atmospheres above 82.5% relative humidity.Blocking the anus or the dorsal surface with wax does not prevent water vapor uptake, but interference with movements of the mouthparts or blocking the mouth with wax prevents such uptake.