Page 1 of 3 - About 25 Essays
  • Epithelium Essay

    Aim 1: Analyzing the formation of the epithelium of visceral endoderm surrounding the internal cavity in locally-instructed embryoids Sub-aim 1.1: Investigating the formation of an endodermal epithelium around the cavity Rationale: VE is derived from PrE, an epithelial tissue that separates the ICM from the blastocoel. PrE and Epiblast (Epi) cells exist in a ‘salt and pepper’ manner in the ICM by E3.5, which can be visualized by the complementary expression patterns of Gata6 (PrE) and Nanog (Epi) (Chazaud et al., 2006). The PrE cells are sorted from the ICM through differential adhesion (Gerbe et al., 2008) and cortical tension (Moore et al., 2009) and become a morphologically distinct tissue by E4.5. PrE/VE epithelial tissue surrounds in the…

    Words: 1122 - Pages: 5
  • Developmental Potential Of Stem Cells

    to revert cells back to totipotency or pluripotency (Image from: Mitalipov & Wolf, 2009). Totipotency, depicted by its name as total power is the ability to produce and differentiate into any type of cells found in the organism (Figure 1). This type of stem cell has the ability to recreate the whole organism. When an egg is fertilized by a sperm, it creates a totipotent cell (also known as a zygote) (Asch, Simerly, Ord, Ord, & Schatten, 1995). The totipotent cell will develop to different…

    Words: 844 - Pages: 4
  • Gastrointestinal System Case Study

    Introduction The gastrointestinal system (digestive system) is the alimentary tract from the mouth to the anus with its associated glands and organs (Moore, 2016) It originates from two germ layers, the endoderm and mesoderm, and receives nerve supply by cells derived from the third germ layer, the ectoderm(van den Brink, 2007) (McLin et al., 2009) The earliest stage of development is the ‘primordial gut’ which forms during the 4th week as the head, tail (caudal eminence) and lateral folds.…

    Words: 2031 - Pages: 9
  • Flatworm Essay

    Many roundworm species are free-living. They have a body cavity that is between the endoderm and mesoderm tissues. The endoderm germ layer is like an internal layer and the mesoderm germ layer is like a middle layer. The body cavity is known as a pseudocoelom, due to it only being relatively lined with the mesoderm tissue. Roundworms have a digestive tract that consists of two openings, which are a mouth and an anus. Roundworms need to depend on diffusion, or the natural spreading of particles…

    Words: 579 - Pages: 3
  • Chordata Research Paper

    Chordata is a phylum of the animal kingdom that includes animals possessing notochord, pharyngeal gill slit and dorsal tubular nerve cord. Although the name Chordata is attributed to William Bateson (1885), it was already prevalent around 1880. Phylum Chordata, though not the largest, is the most diverse phylum in the animal kingdom. Chordates are cosmopolitan and are well represented in marine, freshwater as well as terrestrial habitats from the equator to the high northern and southern…

    Words: 928 - Pages: 4
  • Flatworm Research Paper

    Animals in the phylum Platyhelminthes, widely known as flatworms, were the first to develop bilateral symmetry, triploblasty, and cephalization. Bilateral symmetry means that an animal's left and right side of their body are mirror images of each other. Cephalization is the development of nervous tissues becoming concentrated towards the anterior end of an animal. Triploblasty means that an organism has three tissue layers, an ectoderm (outer layer), mesoderm (middle layer), and an endoderm…

    Words: 402 - Pages: 2
  • Porifer Animalia

    invertebrates (Myers, 2002). Typically, they can be found in marine water, freshwater, and general damp terrestrial habitats, being free living, but more than often parasitic (Myers, 2002). Additionally, platyhelminths are known to have three germ layers: an endoderm, ectoderm, and a mesoderm. The addition of the mesoderm allows animals to form true organ systems; however, this is all truly possible due to the mesoderm’s key feature, the coelom- a fluid-filled cavity that stores and protects…

    Words: 1323 - Pages: 6
  • Prenatal Development Periods

    yielding four cells and so on”(p.67). Around the end of the first week the dividing cells developed into a blastula. A blastula is the ball of cells around a fluid filled center that makes it’s way inside the female 's uterus. After they are formed the blastula starts to burrow in the lining of the uterus. The blastula will start up a process that separates the cells according to their future functions. A couple of the cells will move to another side of the blastocyst and will begin to make the…

    Words: 1564 - Pages: 7
  • Theories Of Biological Criminology

    evolution process, meaning they are more likely to be criminals (McLaughlin and Muncie, 2012: 26). Lombroso carried out a study, where he examined 383 male convicts, and found that 21% had just one of the biological traits whereas 43% had five or more. This lead to the conclusion that the presence of five or more stigmata indicated atavism. William Sheldon also made an attempt to make a link between an individual’s appearance and criminal behaviour. He believed that there was a strong…

    Words: 1681 - Pages: 7
  • Embryonic Stem Cells In The Body

    bone, etc.). Adult or somatic stem cells exist throughout the body after embryonic development and are found inside of different types of tissue. Embryonic stem cells are a copy from a four- or five-day-old human embryo that is in the blastocyst phase of development. Embryonic stem cells are the most potent since they must become every type of cell in the body. The full classification includes:Totipotent - the ability to differentiate into all possible cell types some examples are the zygote…

    Words: 735 - Pages: 3
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