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Related Concept Videos

Viscosity01:17

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...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
Vascular Resistance01:20

Vascular Resistance

Vascular resistance is a critical concept in understanding blood flow dynamics in the circulatory system. It refers to the resistance that blood encounters as it flows through the blood vessels. This resistance is a key factor in determining blood pressure and cardiac workload.
The primary determinants of vascular resistance are vessel diameter, blood viscosity, and vessel length. Among these, vessel diameter plays the most significant role due to the fourth power relationship described by...
Viscosity01:27

Viscosity

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...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are not...
Viscosity of Fluid01:19

Viscosity of Fluid

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: Jul 10, 2026

Assessment of Vascular Function in Patients With Chronic Kidney Disease
08:50

Assessment of Vascular Function in Patients With Chronic Kidney Disease

Published on: June 16, 2014

Blood viscosity and aging.

Coppola1, Caserta, De Lucia D

  • 1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Policlinico Universitario, Piazza Miraglia 2, 80138, Naples, Italy

Archives of Gerontology and Geriatrics
|September 16, 2000
PubMed
Summary
This summary is machine-generated.

Whole blood viscosity shows no significant age-related changes overall. However, plasma fibrinogen increases with age, while hemoglobin and blood cell counts decrease, particularly in males.

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Area of Science:

  • Gerontology
  • Hematology
  • Biophysics

Background:

  • Aging is associated with various physiological changes.
  • Understanding age-related alterations in blood properties is crucial for health assessment.

Purpose of the Study:

  • To investigate the relationship between whole blood viscosity and its determinants (plasma fibrinogen, hematocrit, hemoglobin, blood cell count) and aging.
  • To analyze these relationships across different age groups and sexes.

Main Methods:

  • Whole blood viscosity was measured at two shear rates (450 and 45 s⁻¹) using a cone-plate digital viscosimeter.
  • Hematological parameters (hematocrit, hemoglobin, blood cell count) were analyzed using an automatic Coulter Counter.
  • Plasma fibrinogen concentration was determined via a clotting method.

Main Results:

  • Overall, whole blood viscosity did not significantly differ across age groups.
  • Plasma fibrinogen concentration significantly increased with age (P<0.001).
  • Hemoglobin, red blood cell count, and platelet count were significantly lower in older individuals.
  • In males, blood viscosity at a high shear rate (450 s⁻¹) negatively correlated with age (P<0.005), linked to decreased hematocrit.

Conclusions:

  • Aging impacts blood composition, notably increasing plasma fibrinogen and decreasing red blood cells and hemoglobin.
  • While overall blood viscosity remains stable, sex-specific changes in viscosity correlate with hematocrit decline in aging males.