Fertilization Process
16 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary function of the removal of membrane proteins during capacitation?

  • To aid in the penetration of the oocyte (correct)
  • To increase the motility of sperm
  • To facilitate the fusion of sperm with the oocyte plasma membrane
  • To enhance the chances of polyspermy
  • What is the term for the condition where multiple sperm fuse with the oocyte?

  • Fertilization
  • Capacitation
  • Cleavage
  • Polyspermy (correct)
  • During which stage of fertilization does the sperm lose its tail?

  • Penetration of the oocyte
  • Capacitation
  • After completing meiosis II
  • Fusion with the oocyte plasma membrane (correct)
  • What is the resulting product of the fusion of sperm with the oocyte?

    <p>Diploid zygote</p> Signup and view all the answers

    What is the primary characteristic of the cell divisions during cleavage?

    <p>Rapid mitotic divisions</p> Signup and view all the answers

    Where does the process of capacitation occur?

    <p>Cervical mucus</p> Signup and view all the answers

    What is the purpose of the corona radiata and zona pellucida?

    <p>To block sperm penetration</p> Signup and view all the answers

    What is the stage of fertilization that occurs immediately after sperm deposition in the vagina?

    <p>Waiting period for capacitation</p> Signup and view all the answers

    What is the main purpose of the abundant cytoplasm in the conceptus during pre-embryonic cleavages?

    <p>To allow for rapid cell division without changing the total volume</p> Signup and view all the answers

    What would happen to the endometrium if the implanted blastocyst did not secrete human chorionic gonadotropin (hCG)?

    <p>It would slough off during the process of menses</p> Signup and view all the answers

    What is the primary function of the syncytiotrophoblast cells during implantation?

    <p>To invade and digest the endometrium</p> Signup and view all the answers

    What is the main benefit of a small surface area-to-volume ratio for the zygote?

    <p>It is beneficial for the zygote to conserve nutrients and energy</p> Signup and view all the answers

    What is the typical duration of the implantation process?

    <p>About a week</p> Signup and view all the answers

    What structures are formed as the pre-embryo floats to the uterus?

    <p>The blastocyst and the inner cell mass</p> Signup and view all the answers

    What is the role of the LH-like hormone human chorionic gonadotropin (hCG) during implantation?

    <p>It maintains the integrity of the corpus luteum</p> Signup and view all the answers

    How does the blastocyst obtain nutrients during its journey to the uterus?

    <p>It absorbs nutrients from the uterine secretions</p> Signup and view all the answers

    Study Notes

    Fertilization

    • Fertilization is the process of forming a fertilized egg, resulting from sperm deposition in the vagina during copulation.
    • Sperm must undergo capacitation, a gradual process of membrane protein removal and release, to penetrate the egg.
    • Capacitation occurs as sperm travel through cervical mucus, uterus, and uterine tubes, enabling them to penetrate the oocyte.
    • Hundreds of capacitated sperm must break through the corona radiata and zona pellucida to fuse with the oocyte plasma membrane.
    • Once fused, the sperm loses its tail and migrates to the center of the oocyte, completing meiosis II and forming a diploid zygote.

    Cleavage

    • Cleavage is the process of rapid mitotic divisions in the zygote, occurring as it travels down the uterine tube towards the uterus.
    • Cell growth periods between divisions are very short, resulting in smaller daughter cells.
    • Pre-embryonic cleavages utilize the abundant cytoplasm of the conceptus, dividing rapidly without changing the total volume.
    • A small surface area-to-volume ratio is beneficial to the zygote, allowing for efficient diffusion of nutrients and waste.

    Implantation

    • Implantation begins around day 6-7 after ovulation, as the blastocyst floats to the uterine cavity.
    • The endometrium's special glycoproteins aid in blastocyst implantation, and the trophoblast cells attach to the endometrium.
    • Syncytiotrophoblast cells invade and digest the endometrium, covering and sealing off the implanted blastocyst within a short time.
    • Implantation takes about a week and is completed by the 14th day after ovulation, maintained by human chorionic gonadotropin (hCG) secreted by the trophoblast cells.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Learn about the process of fertilization, where sperm fuses with the egg, resulting in a fertilized egg. Understand the journey of sperm through the cervical mucus, uterus, and uterine tubes.

    More Like This

    Human Fertility Basics
    18 questions

    Human Fertility Basics

    WellPositionedNiobium avatar
    WellPositionedNiobium
    Human Fertility and Reproduction
    10 questions
    Female Fertility Factors
    8 questions

    Female Fertility Factors

    GallantRevelation avatar
    GallantRevelation
    Use Quizgecko on...
    Browser
    Browser