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Related Concept Videos

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In statistics, several tools are used to interpret the data. Measures of central tendency represent the characteristics of the data, such as mean, median, and mode. Additionally, measures of variance like standard deviation and range are used to find the spread of data from the mean. Relative standing measures the distance between data locations. Commonly used measures of relative standings are percentile, z score, and quartiles.
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Data are individual items of information obtained from a population or sample. Data may be classified as qualitative (categorical), quantitative continuous, or quantitative discrete. Because it is not practical to measure the entire population in a study, researchers use samples to represent the population. A random sample is a representative group from the population chosen by using a method that gives each individual in the population an equal chance of being included in the sample. Random...
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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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Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
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Directing Effect of Substituents: meta-Directing Groups01:09

Directing Effect of Substituents: meta-Directing Groups

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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
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Systematic Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
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Exploring the Association between Arsenic Exposure and Sperm Quality: A Systematic Review and Meta-analysis.

Rohit Gautam1, Eepsita Priyadarshini2, Pratibha Maan1

  • 1Division of Reproductive Child Health and Nutrition, Indian Council of Medical Research, New Delhi, India.

Journal of Human Reproductive Sciences
|January 21, 2026
PubMed
Summary
This summary is machine-generated.

Arsenic exposure may reduce semen volume, but its effects on sperm concentration and motility are unclear. More research is needed to confirm these findings on male reproductive health.

Keywords:
Arsenicmale infertilitysperm concentrationsperm morphologysperm motility

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Area of Science:

  • Environmental Health
  • Reproductive Toxicology
  • Human Health Risk Assessment

Background:

  • Arsenic is a widespread environmental toxicant found in food, water, and air.
  • Exposure to arsenic, both acute and chronic, poses significant health risks.
  • Studies indicate a negative impact of arsenic on the male reproductive system.

Purpose of the Study:

  • To systematically review and evaluate the impact of arsenic exposure on human semen quality.
  • To determine the association between arsenic exposure levels and a decline in semen quality parameters.

Main Methods:

  • A systematic literature search was conducted across Scopus, PubMed, and Cochrane central databases.
  • Four studies were included after a two-step screening process by independent reviewers.
  • Two cross-sectional studies were pooled for meta-analysis; two case-control studies were described narratively.

Main Results:

  • Meta-analysis indicated that pooled mean semen volume, sperm concentration, and sperm motility were within or above WHO reference values, despite high heterogeneity.
  • Arsenic exposure was associated with a potential negative influence on semen volume.
  • Effects on sperm concentration and motility were inconsistent across the included studies.

Conclusions:

  • Arsenic exposure may negatively impact semen volume, but evidence for effects on sperm concentration and motility is inconclusive.
  • Limited studies and methodological variability restrict definitive conclusions on arsenic's reproductive toxicity.
  • Large-scale, longitudinal studies with standardized assessments are necessary to validate these findings and establish causality.