pharyngeal slit

(noun)

filter-feeding organs found in non-vertebrate chordates (lancelets and tunicates) and hemichordates living in aquatic environments

Related Terms

Examples of pharyngeal slit in the following topics:

  • Characteristics of Chordata

    • Animals in the phylum Chordata share four key features: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
    • Some invertebrate chordates use the pharyngeal slits to filter food out of the water that enters the mouth.
    • In vertebrate fishes, the pharyngeal slits develop into gill arches, the bony or cartilaginous gill supports.
    • In most terrestrial animals, including mammals and birds, pharyngeal slits are present only during embryonic development.
    • In these animals, the pharyngeal slits develop into the jaw and inner ear bones.

  • Chordates and the Evolution of Vertebrates

    • Adults only maintain pharyngeal slits and lack a notochord, a dorsal hollow nerve cord, and a post-anal tail.
    • Suspended material is filtered out of this water by a mucous net (pharyngeal slits) and is passed into the intestine via the action of cilia.
    • Members of Cephalochordata possess a notochord, dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail in the adult stage.
    • Adult lancelets retain the four key features of chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
    • Water from the mouth enters the pharyngeal slits, which filter out food particles.

  • Phylum Chordata

    • Pharyngeal slits, which allow water that enters through the mouth to exit without continuing through the entire digestive tract.

  • Characteristics of Vertebrates

    • As chordates, all vertebrates have a similar anatomy and morphology with the same qualifying characteristics: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.

  • Single Slit Diffraction

    • In single slit diffraction, the diffraction pattern is determined by the wavelength and by the length of the slit.
    • A slit that is wider than a single wave will produce interference-like effects downstream from the slit.
    • It is easier to understand by thinking of the slit not as a long slit, but as a number of point sources spaced evenly across the width of the slit.
    • Visualization of single slit diffraction when the slit is equal to one wavelength.
    • This figure shows single slit diffraction, but the slit is the length of 4 wavelengths.

  • Class Anthozoa

    • They have slit-like mouth openings and a pharynx, which is the muscular part of the digestive system that serves to ingest as well as egest food.
    • Mesenteries do not divide the gastrovascular cavity completely; the smaller cavities coalesce at the pharyngeal opening.

  • Pharyngitis

    • Pharyngitis is an inflammation of the throat that has many causes, some of which are bacterial infections.
    • Pharyngitis is an inflammation of the throat.
    • Like many types of inflammation, pharyngitis can be acute or chronic.
    • Pharyngitis can result in very large tonsils.
    • This is the most common bacterial cause of pharyngitis (15–30%).

  • Young's Double Slit Experiment

    • The wave characteristics of light cause the light to pass through the slits and interfere with itself, producing the light and dark areas on the wall behind the slits.
    • Each slit is a different distance from a given point on the wall behind it.
    • Double slits produce two coherent sources of waves that interfere.
    • (a) Light spreads out (diffracts) from each slit because the slits are narrow.
    • (b) Double-slit interference pattern for water waves are nearly identical to that for light.

  • Properties of Waves and Light

    • In many cases, the properties of light can be explained as a wave, as was shown in Young's double-slit experiment.
    • If light consisted strictly of ordinary or classical particles, and these particles were fired in a straight line through a slit and allowed to strike a screen on the other side, we would expect to see a pattern corresponding to the size and shape of the slit.
    • The smaller the slit, the greater the angle of spread.
    • Similarly, if light consisted strictly of classical particles and we illuminated two parallel slits, the expected pattern on the screen would simply be the sum of the two single-slit patterns.
    • Discuss how wave motion arises and its measurable properties, noting the conlcusions of Young's double slit experiment

  • Fourth Week of Development

    • During the fourth week of development, the first pharyngeal arch, also called the mandibular arch, is the first of six pharyngeal arches that begins to develop.
    • It is located between the stomodeum and the first pharyngeal groove.