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Related Concept Videos

Fertilization01:38

Fertilization

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Spermatogenesis01:41

Spermatogenesis

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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Spermatogenesis01:22

Spermatogenesis

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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
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Meiosis I01:49

Meiosis I

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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Meiosis I03:09

Meiosis I

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Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
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What is Meiosis?01:36

What is Meiosis?

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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Related Experiment Video

Updated: Mar 28, 2026

Recording Electrical Currents across the Plasma Membrane of Mammalian Sperm Cells
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Ion currents involved in gamete physiology.

Alessandra Gallo1, Elisabetta Tosti

  • 1Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Naples, Italy.

The International Journal of Developmental Biology
|December 19, 2015
PubMed
Summary

Gametes utilize ion channels to control electrical activity, crucial for reproduction. This review explores ion fluxes in gamete function, from maturation to fertilization, across species.

Area of Science:

  • Reproductive Biology
  • Cell Physiology
  • Ion Channel Research

Background:

  • Gametes exhibit electrogenic properties due to ion currents through plasma membrane channels.
  • Ion channel modulation is vital for gamete maturation, activation, and fertilization.
  • Sodium, potassium, and calcium ions are key players in oocyte and sperm physiology.

Purpose of the Study:

  • To review the occurrence, modulation, and function of ion fluxes in gametes.
  • To cover events from gametogenesis through early fertilization.
  • To examine these processes across diverse animal models, including humans.

Main Methods:

  • Literature review of studies on gamete electrophysiology.
  • Analysis of ion channel activity and ion flux mechanisms.

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  • Synthesis of data from marine animals to humans.

    • Main Results:

    • Ion currents dynamically regulate gamete electrical properties in response to stimuli.
    • Specific ion channels and fluxes are conserved across many species.
    • Ion channel activity is essential for successful fertilization.

    Conclusions:

    • Ion fluxes play a dynamic and critical role in overall gamete physiology.
    • Understanding these ion dynamics offers potential clinical and technological applications in reproduction.