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Viscosity

Viscosity

When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...

Viscosity

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Viscosity is a property of fluids that measures their resistance to flow. It is influenced by factors such as the surface area of contact, the gradient of flow speed, and the fluid's viscosity constant, called the coefficient of viscosity. The coefficient of viscosity, also known as dynamic viscosity, is denoted by the symbol η. It determines the proportionality between the viscous force and the gradient of flow speed.Newton's law of viscosity states that the viscous force on a faster-moving...

Sperm Transport

Sperm Transport

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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Surface Tension, Capillary Action, and Viscosity

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...

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 reproductive...

Viscosity of Fluid

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Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.

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Related Experiment Video

Updated: Jun 1, 2026

Sperm Collection and Computer-Assisted Sperm Analysis in the Teleost Model Japanese Medaka (Oryzias latipes)

Sperm Collection and Computer-Assisted Sperm Analysis in the Teleost Model Japanese Medaka (Oryzias latipes)

Published on: October 6, 2022

Sperm motility: is viscosity fundamental to progress?

Jackson C Kirkman-Brown¹, David J Smith

¹The Centre for Human Reproductive Science, Birmingham Women's Hospital, Edgbaston, Birmingham, UK. j.kirkmanbrown@bham.ac.uk

Molecular Human Reproduction

|June 10, 2011

Summary

This summary is machine-generated.

Sperm migration success in internal fertilization depends on navigating complex female tracts. Mucus viscosity, often overlooked, significantly influences sperm selection and behavior, impacting fertility.

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Area of Science:

Reproductive Biology
Biophysics

Background:

Internal fertilization requires sperm to migrate through the female reproductive tract to reach the oocyte.
This journey involves navigating a complex, three-dimensional environment with significant scale differences.
Current research often emphasizes chemotaxis, neglecting other crucial factors.

Purpose of the Study:

To highlight the underappreciated role of mucus viscosity in sperm migration and selection.
To emphasize the importance of viscosity in modulating sperm behavior throughout the female tract.
To underscore the implications of viscosity for in vitro to in vivo experimental extrapolation.

Main Methods:

This study is primarily a review and theoretical analysis of existing research.
It synthesizes findings on sperm behavior, female tract physiology, and fluid dynamics.
No new experimental data was generated; it focuses on reinterpreting existing knowledge.

Main Results:

Mucus viscosity plays a critical role in controlling sperm entry and movement within the female reproductive tract.
Viscosity acts as a selective mechanism, influencing which sperm successfully migrate.
Changes in viscosity can modulate sperm behavior, affecting their ability to reach the oocyte.

Conclusions:

Mucus viscosity is a fundamental factor in successful sperm migration and fertilization.
Understanding viscosity is essential for interpreting sperm behavior in both natural and experimental settings.
The impact of viscosity must be considered in reproductive medicine and the development of contraceptives.