Biology of Ovarian Follicles
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Questions and Answers

What is the function of the chalaza in an egg?

  • To maintain the orientation of the blastodisc for thermoregulation (correct)
  • To regulate the growth of the embryo
  • To produce the egg white and albumin
  • To protect the egg from external damage

    • What is the term for the region containing the nucleus in a mature ovum?

  • Nucleus-containing region (correct)
  • Blastodisc
  • Yolk
  • Cytoplasm

    • What is the purpose of the accessory layers in an egg?

  • To regulate the temperature of the egg
  • To protect the egg cell from external damage (correct)
  • To provide nutrients to the embryo
  • To facilitate the fertilization process

    • What is the term for the bulging yellow cells in the ovarian epithelium?

    <p>Ovarian follicle</p> Signup and view all the answers

    Why is the egg difficult to beat?

    <p>Due to the presence of the chalaza</p> Signup and view all the answers

    What is the term used to describe the cleaving blastodisc?

    <p>Blastoderm</p> Signup and view all the answers

    What is unique about the oviduct in birds compared to other vertebrates?

    <p>It is relatively longer in proportion to the body</p> Signup and view all the answers

    If an egg is to be fertilized, when must it occur?

    <p>Before the addition of accessory coverings</p> Signup and view all the answers

    What is the purpose of injecting hormones into hen layers?

    <p>To hasten ovulation</p> Signup and view all the answers

    What is a result of simultaneous ovulation in hen layers?

    <p>Two oocytes are released and receive shared accessory coverings</p> Signup and view all the answers

    Study Notes

    Ovarian Structure

    • Mature eggs move towards the wall of the ovarian epithelium
    • Ovarian follicle/ovum is characterized by bulging yellow large cells

    Egg Composition

    • Egg cell is surrounded by accessory layers for protection, including:
      • Egg shell
      • Egg white
      • Thicker albumin

    Mature Ovum Structure

    • Contains three main regions:
      • Yolk
      • Region containing the nucleus
      • Region containing the active cytoplasm

    Egg White and Yolk

    • Whitish, sticky jelly-like liquid structure outside the yellow yolk is called the white yolk
    • Albumin is the substance attached to the yolk

    Chalaza Function

    • Chalaza ensures the blastodisc is always oriented on top for thermoregulation
    • Allows the mother hen to sit on top of the egg, keeping the blastodisc in the correct position

    Development of Chick Embryo

    • An unfertilized cleaving blastodisc is called a blastoderm.
    • The blastoderm will give rise to the chick embryo, but not the whole yolk.

    Characteristics of Aves

    • Aves have the longest oviduct relative to their body size among all vertebrates.
    • The oviduct is divided into four regions: infundibular region, magnus region, shell region, and shell gland region.

    Fertilization and Ovulation

    • Fertilization of the egg must occur before the accessory coverings are added.
    • In some cases, such as VitaLink PH, hen layers are injected with hormones to hasten ovulation, allowing two oocytes to be released simultaneously and receive accessory coverings together.

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    Description

    This quiz covers the structure and composition of ovarian follicles, including the ovum, yolk, and accessory layers.

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