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相关概念视频

Infertility in Males01:23

Infertility in Males

332
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...
332
Spermatogenesis01:41

Spermatogenesis

103.4K
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...
103.4K
Sperm Structure and Semen Composition01:22

Sperm Structure and Semen Composition

5.0K
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...
5.0K
Menopause01:28

Menopause

250
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...
250
Sperm Transport01:15

Sperm Transport

1.4K
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.
The maturation phase occurs in the epididymis, where sperm...
1.4K

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Updated: Sep 11, 2025

Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects
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减少或增加精子度? 在40年中,中国肥沃男性的数据.

Haiying Geng1,2, Elizabeth R Rayburn3, Qiuhong Wang1,2

  • 1Department of Clinical Laboratory, Affiliated Maternity and Child Health Care Hospital of Nantong University, Nantong, 226001, Jiangsu, China.

Journal of assisted reproduction and genetics
|August 11, 2025
PubMed
概括

在40多年来,中国肥沃男性的精子度显著下降. 这一趋势在21世纪加速,可能与环境和生活方式因素有关.

关键词:
肥沃的中国男性.线性回归分析线性回归分析精液质量 精液质量精子中的精子度.

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科学领域:

  • 生殖健康 生殖健康
  • 环境健康 环境健康
  • 安德罗学与人类学

背景情况:

  • 精子度是男性生殖健康的关键指标.
  • 调查精子质量的长期趋势对于公共卫生至关重要.
  • 了解人口特异性趋势,比如中国的人口特异性趋势,至关重要.

研究的目的:

  • 从1984年到2023年,分析中国肥沃男性精子度的趋势.
  • 确定对观察到的精子质量变化的潜在促成因素.

主要方法:

  • 94个中英文文学来源的系统综述.
  • 分析了来自中国27个省和城市的14634个人的数据.
  • 应用最小平方线性回归和ANOVA进行统计分析.

主要成果:

  • 从1984年到2023年,观察到精子度的统计学显著整体下降.
  • 在每十年的样本采集过程中,精子度都在下降.
  • 最大的下降发生在2004年至2013年之间.

结论:

  • 肥沃的中国男性在过去的40年里,精子度呈现出令人担忧的下降趋势.
  • 这种下降似乎在21世纪后加速了.
  • 潜在的原因包括环境污染,工业化,生活方式变化和电子设备辐射,需要进一步调查.