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Chapter 51: Problem 15

Predict in which period of the ovarian cycle that fertilization is most likely to occur.

Short Answer

Expert verified
Fertilization is most likely during ovulation, around day 14 of the ovarian cycle.

Step by step solution

01

Understanding the Ovarian Cycle Phases

The ovarian cycle is divided into three main phases: the follicular phase, ovulation, and the luteal phase. It typically lasts about 28 days, but this can vary among individuals.
02

Identify the Phase with Ovulation

Ovulation usually occurs around the middle of the cycle, typically on day 14 in a 28-day cycle. During ovulation, an egg is released from the ovary. This is the most fertile period.
03

Assess Fertilization Likelihood

Fertilization is most likely to occur when a mature egg is present, which happens during ovulation. The egg can survive about 24 hours post-release, enhancing the chances of fertilization if sperm is present.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Follicular Phase
The follicular phase is the first stage of the ovarian cycle and starts on the first day of menstruation. During this phase, the goal is to prepare one of the ovaries to release an egg.
Follicle-stimulating hormone (FSH) plays a critical role in this process. It stimulates the growth of several follicles in the ovaries.
  • Among these follicles, usually, one becomes dominant and prepares an egg for release.
  • This egg maturation process typically spans from day 1 to day 14 of a 28-day cycle.
The follicular phase is also marked by the thickening of the uterine lining. This prepares the uterus for a possible pregnancy, providing a nurturing environment for a fertilized egg to implant and grow.
Ovulation
Ovulation is a key event in the ovarian cycle, marking its midpoint, typically around day 14 in a 28-day cycle. During this phase, the mature egg is released from the dominant follicle in the ovary.
  • The release of the egg is triggered by a surge in luteinizing hormone (LH).
  • Once released, the egg moves into the fallopian tube where it can encounter sperm.
This is the period when the fertility window opens, making it the ideal time for fertilization to occur. Remember, the egg is viable for about 24 hours post-release. Therefore, timing intercourse around ovulation increases the chances of conception significantly.
Luteal Phase
The luteal phase follows ovulation and spans from about day 15 to day 28 of a typical cycle. During this time, the body prepares for a potential pregnancy.
  • The ruptured follicle transforms into the corpus luteum, which secretes progesterone to maintain the uterine lining.
  • Progesterone ensures that the uterine lining remains ready for a fertilized egg to implant.
If fertilization does not occur, the corpus luteum degenerates, leading to a drop in progesterone levels. This results in the shedding of the uterine lining, known as menstruation, marking the end of the luteal phase and the start of a new cycle. The luteal phase is critical for supporting early pregnancy should fertilization occur.

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Most popular questions from this chapter

Identify the function of the uterus.

Explain how a sperm penetrates an egg during fertilization.

The word blastocyst is derived from the Greek blastos, which means "bud," and kustis, which means "liquid-filled sac." Using this information, explain why the term blastocyst is a good name for the biological structure that the term describes.

Name the male and female gamete-producing organs.

List the differences between an embryo and a fetus.
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