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Related Concept Videos

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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Infertility in Males01:23

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Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Disorders of the Male Reproductive System01:20

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Men's health issues are increasingly recognized as significant, with several conditions posing common threats. Among these, testicular cancer is especially prevalent in younger men, particularly those aged 20 to 35 years. The disease often manifests as a painless mass in the testicles, sometimes accompanied by a sensation of heaviness or a dull ache.
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Testosterone: Functions and Regulation01:26

Testosterone: Functions and Regulation

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The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...
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Testes: Histology01:27

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A tough, fibrous membrane, the tunica albuginea, covers the testes, extending inward to form fibrous partitions or septa, dividing them into internal compartments called lobules. Each lobule has 1 to 3 tightly coiled seminiferous tubules where sperm production occurs. These tubules merge into a tubular network at the back of the testis, known as the rete testis. It connects to 15 to 20 efferent ductules, leading to the epididymis.
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Related Experiment Video

Updated: Jun 11, 2025

An Experimental Approach to Investigating Effects of Artificial Light at Night on Free-Ranging Animals: Implementation, Results, and Directions for Future Research
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Light pollution: time to consider testicular effects.

Peter Y Liu1

  • 1Division of Endocrinology, Department of Medicine, David Geffen School of Medicine at UCLA, Harbor-UCLA Medical Center and Genomics Institute, The Lundquist Institute, Torrance, CA, United States.

Frontiers in Toxicology
|October 1, 2024
PubMed
Summary
This summary is machine-generated.

Artificial light at night is a growing pollutant with unrecognized reproductive effects. This review highlights how light exposure disrupts hormonal and metabolic networks, impacting reproductive health and necessitating research into testicular effects.

Keywords:
Leydig cellcircadianclockfertilitytestosterone

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Area of Science:

  • Environmental Toxicology
  • Reproductive Biology
  • Chronobiology

Background:

  • Modern technological advancements have drastically increased artificial light exposure at night.
  • Light pollution is an underrecognized environmental pollutant with potential impacts on biological systems.
  • The reproductive system is closely linked to metabolism and circadian rhythms, which are sensitive to light.

Purpose of the Study:

  • To review the physiological and pathophysiological mechanisms linking light exposure to reproductive health.
  • To highlight the role of light pollution in reproductive toxicology.
  • To emphasize the need to investigate the testicular effects of light pollution.

Main Methods:

  • Review of existing literature on light exposure, circadian rhythms, metabolism, and reproductive health.
  • Analysis of physiological and pathophysiological pathways affected by light.
  • Consideration of recent human studies on photoreceptors, melatonin suppression, and circadian re-entrainment.

Main Results:

  • Light exposure, even at low levels, can disturb hormonal, metabolic, and circadian systems.
  • Recent studies demonstrate links between light exposure, melatonin suppression, and circadian alignment.
  • Evidence suggests a connection between light-dark cycle alignment and metabolic health.

Conclusions:

  • Light pollution poses a significant, yet overlooked, threat to reproductive health.
  • Understanding the mechanisms by which light affects reproductive networks is crucial for reproductive toxicology.
  • Further research is urgently needed to address the testicular effects of light pollution.