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Related Concept Videos

Sperm Structure and Semen Composition01:22

Sperm Structure and Semen Composition

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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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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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Related Experiment Video

Updated: Oct 11, 2025

Author Spotlight: Advancing Male Infertility Research by Unraveling Sperm Metabolism and Mitochondrial Function
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Mitochondria-Targeted Compounds to Assess and Improve Human Sperm Function.

Sara Escada-Rebelo1,2,3, Maria Inês Cristo2, João Ramalho-Santos2,4

  • 1PhD Programme in Experimental Biology and Biomedicine, Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.

Antioxidants & Redox Signaling
|December 1, 2021
PubMed
Summary

Male infertility, often linked to impaired sperm function, is frequently caused by mitochondrial dysfunction and oxidative stress. Mitochondria-targeted compounds show promise for assessing and improving sperm quality, especially after cryopreservation.

Keywords:
ROS detectionmitochondria-targeted antioxidantsmitochondria-targeted fluorescent probesmitochondrial functionmitochondrial membrane potentialoxidative stresssperm function

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Area of Science:

  • Reproductive biology
  • Mitochondrial medicine
  • Oxidative stress research

Background:

  • Male factor infertility affects 50% of infertile couples, primarily due to impaired sperm function.
  • Mitochondrial dysfunction and increased reactive oxygen species (ROS) are key contributors to poor sperm quality.
  • Mitochondrial functionality is a recognized indicator of sperm functionality.

Purpose of the Study:

  • To review methods for assessing mitochondrial parameters related to sperm quality.
  • To discuss therapeutic strategies using mitochondria-targeted antioxidants for male infertility.
  • To explore applications in improving sperm function post-cryopreservation.

Main Methods:

  • Review of current scientific literature on mitochondrial assessment in sperm.
  • Analysis of therapeutic approaches utilizing mitochondria-targeted compounds.
  • Synthesis of data on oxidative stress and ROS in male infertility.

Main Results:

  • Established link between mitochondrial dysfunction, ROS, and impaired sperm function.
  • Mitochondria-targeted compounds are effective in assessing sperm quality.
  • These compounds show therapeutic potential for improving sperm function.

Conclusions:

  • Mitochondria-targeted compounds are valuable tools for assessing sperm function.
  • Antioxidant strategies targeting mitochondria offer promising therapeutic benefits for male infertility.
  • Further research is needed to fully establish the clinical utility of these approaches.