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Sorry: The Human Body And The Circulatory System

Insects or Insecta from Latin insectum are pancrustacean hexapod invertebrates and the largest group within the arthropod phylum. Definitions and circumscriptions vary; usually, insects comprise a class within the Arthropoda. As used here, the term Insecta is synonymous with Ectognatha. Insects have a chitinous exoskeletona three-part body headthorax and abdomenthree pairs of jointed legs Cidculatory, compound eyes and one pair of antennae. Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms. Nearly all insects hatch from eggs. Insect growth is constrained by the inelastic exoskeleton and development involves a series of molts. The immature stages often differ from the adults in structure, habit and habitat, and can include a passive pupal stage in those groups that undergo four-stage metamorphosis. Insects that Bkdy three-stage metamorphosis lack a pupal stage and adults develop through a series of nymphal stages.

The Human Body And The Circulatory System

Episode 52 – The Human Body – The Circulatory System – Part Two

The most diverse insect groups appear to have coevolved with flowering plants. Adult insects typically move about by walking, flying, or sometimes swimming.

As it allows for rapid yet stable movement, many insects adopt a tripedal gait in which they walk with their legs touching the ground in alternating triangles, composed of the front and rear on one side with the middle on the other side. Insects are the only invertebrates to have evolved flight, and all flying insects derive from one common ancestor. Many insects spend at least part of their lives under water, with larval adaptations that include gillsand some adult insects are aquatic and have adaptations for swimming. Some species, such as water stridersare capable of walking on the surface of water. Insects are mostly solitary, but some, such as certain beesants and termitesare social and live in large, well-organized colonies. Some insects, such as earwigsshow maternal care, guarding their eggs and young.

Features of Circulatory System

Insects can communicate with each other in a variety of ways. Male moths can sense the pheromones of female moths over great distances. Other species communicate with sounds: crickets stridulateor rub their wings together, to attract a mate and repel other males.

Lampyrid beetles communicate Bod light. Humans regard certain insects as pestsand attempt to control Circulwtory using insecticidesand a host of other techniques. Some insects damage The Human Body And The Circulatory System by feeding on sap, leaves, fruits, or wood. Some species are parasiticand may vector diseases. Some insects perform complex ecological roles; blow-fliesfor example, help consume carrion but also spread diseases. Insect pollinators are essential to the life cycle of many flowering plant species on which most organisms, including humans, are at least partly dependent; without them, the terrestrial portion of the biosphere would be devastated.

Silkworms produce silk and honey bees produce honey and both have been domesticated by humans. The word "insect" comes from the Latin word insectummeaning "with a notched or divided body", or literally "cut into", from the neuter singular perfect passive participle of insectare"to cut into, to cut up", from in - "into" and secare "to cut"; [10] because insects appear "cut into" three sections.

The precise definition of the taxon Insecta and the equivalent English name "insect" varies; three alternative definitions are shown in the table. In the broadest circumscriptionInsecta sensu lato consists of all hexapods. A narrower circumscription restricts insects to those hexapods with external mouthparts, and comprises only the last three groups in the table. In this sense, Insecta sensu stricto is equivalent to Ectognatha. Insecta sensu strictissimo is then equivalent to Pterygota.

Hexapoda Insecta, CollembolaDipluraProtura. Crustacea crabsshrimpisopodsetc.]