The union of ovum and sperm is known as

Appeared in: KGMU 2024

Explanation

Fertilization is the precise term for the fusion (union) of the male gamete (sperm) and the female gamete (ovum).
This process results in the formation of a single-celled zygote, which contains the complete set of 46 chromosomes, half from each parent.
According to physiological texts, this event typically occurs in the ampulla, the widest part of the fallopian tube.
The main purpose of fertilization is to combine genetic material and initiate the development of an embryo.

Option A: Follicleation, more commonly known as folliculogenesis, is the process of the maturation of the ovarian follicle. It is a necessary step that happens before the egg is released, not the union of the egg and sperm.
Option C: Placentation is the formation of the placenta. This process occurs much later, after the fertilized ovum (now an embryo) has traveled to the uterus and implanted into the uterine wall.
Option D: Ovulation is the release of the ovum from the ovary. While it is a critical event that makes fertilization possible, it is not the act of fusion itself.

Visual 1: Diagram - A detailed illustration showing a sperm penetrating the layers of an ovum within the fallopian tube. This helps visualize the exact moment of fertilization.
Visual 2: Flowchart - A sequence of events in early pregnancy: Folliculogenesis → Ovulation → Fertilization → Implantation → Placentation. This clarifies the chronological order of each process.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Physiology of Human Reproduction as background academic context rather than a clinical decision trigger.
A clear understanding of the fertile window, based on the timing of ovulation and the viability of sperm (up to 5 days) and ovum (12-24 hours), is essential for nurses providing counseling on contraception and conception.
Knowledge of fertilization is the basis for assisted reproductive technologies (ART) like In Vitro Fertilization (IVF), where fertilization is achieved in a lab.
What if? If a woman has blocked fallopian tubes, fertilization cannot occur naturally because the sperm cannot reach the ovum. This is a common cause of infertility that may require IVF for conception.

How to Approach the Question

This is a factual recall question that tests your knowledge of specific terminology in reproductive physiology.
First, break down the question stem to its core concept: 'the union of ovum and sperm'.
Next, systematically review the definition of each option.
Option A, Follicleation, relates to follicle growth.
Option C, Placentation, relates to placenta formation.
Option D, Ovulation, is the release of the egg.

Concept Tested & Keywords

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