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Related Concept Videos

Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Menopause01:28

Menopause

Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...

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Related Experiment Video

Updated: May 15, 2026

High-Resolution Respirometry to Assess Mitochondrial Function in Human Spermatozoa
08:32

High-Resolution Respirometry to Assess Mitochondrial Function in Human Spermatozoa

Published on: June 23, 2023

Aging and male reproductive function: a mitochondrial perspective.

Sandra Amaral1, Alexandra Amaral, Joao Ramalho-Santos

  • 1CNC Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.

Frontiers in Bioscience (Scholar Edition)
|January 2, 2013
PubMed
Summary
This summary is machine-generated.

Male reproductive aging involves complex molecular and cellular changes. Mitochondria are central to aging, linking age-related decline to male fertility loss.

Related Experiment Videos

Last Updated: May 15, 2026

High-Resolution Respirometry to Assess Mitochondrial Function in Human Spermatozoa
08:32

High-Resolution Respirometry to Assess Mitochondrial Function in Human Spermatozoa

Published on: June 23, 2023

Area of Science:

  • Reproductive biology
  • Gerontology
  • Mitochondrial biology

Background:

  • Male reproductive aging is multifactorial, involving molecular, cellular, and endocrine changes.
  • Age-related fertility loss is influenced by individual characteristics, lifestyle, and environmental factors.
  • Key changes include hypothalamic-pituitary-gonadal axis deregulation, stem cell defects, and impaired spermatogenesis.

Purpose of the Study:

  • To review evidence linking mitochondrial function to male reproductive aging.
  • To explore the role of mitochondria in age-related fertility decline.

Main Methods:

  • Literature review of studies on male reproductive aging and mitochondrial function.
  • Analysis of research on oxidative stress, mitochondrial DNA, and energy metabolism in aging.

Main Results:

  • Mitochondria are implicated in age-related oxidative damage and cellular dysfunction.
  • Mitochondrial energy metabolism and testosterone production are affected by aging.
  • Interdependent processes link mitochondrial health to reproductive capacity.

Conclusions:

  • Mitochondria play a critical role in the aging process of the male reproductive system.
  • Mitochondrial dysfunction is a key factor contributing to age-related male infertility.