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Related Concept Videos

Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
Lipid-derived Compounds in the Human Body01:31

Lipid-derived Compounds in the Human Body

Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various  biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...
Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
Lipid Absorption01:24

Lipid Absorption

Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
These breakdown products bind with bile salts and lecithin to form micelles, which quickly pass between microvilli to come in close contact with the apical...
Blood Studies for Cardiovascular System III: Serum Lipid Profile01:25

Blood Studies for Cardiovascular System III: Serum Lipid Profile

Understanding serum lipids is crucial for maintaining cardiovascular health and preventing heart disease and stroke.
Serum lipids are fats and fatty substances in the blood and are crucial for various bodily functions, including energy storage, cellular structure, and hormone production. Serum lipids consist of cholesterol, triglycerides, and phospholipids.
Cholesterol is a soft, fat-like substance found in all body cells. It is crucial for producing hormones, vitamin D, and substances that aid...
Atherosclerosis III: Management01:26

Atherosclerosis III: Management

Management of atherosclerosis involves an integrated strategy encompassing pharmacological treatment, surgical interventions, lifestyle changes, and nutrition therapy to address the multifactorial nature of the disease.Pharmacological TherapyA cornerstone of atherosclerosis management is the use of pharmacological agents. Statins, such as atorvastatin, are pivotal in inhibiting HMG-CoA reductase, an enzyme that catalyzes an initial step in cholesterol synthesis in the liver. This reduction in...

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Related Experiment Video

Updated: Jul 14, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180&#176; Curved Artery Test Section
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Heat and low-density lipoprotein transfer in healthy aorta using fluid-structure interaction method.

Yonghui Qiao1,2, Su Wang3, Hengjie Guo3

  • 1School of Power and Energy, Northwestern Polytechnical University, Xi'an, China. yhqiao@nwpu.edu.cn.

Biomechanics and Modeling in Mechanobiology
|December 13, 2025
PubMed
Summary

This study reveals how heat and low-density lipoprotein (LDL) transfer in healthy aortas using a fluid-structure interaction model. Findings show LDL concentration correlates with aortic wall temperature and influences hemodynamic factors.

Keywords:
AtherosclerosisComputational hemodynamicsFluid–structure interactionHeat transferLow-density lipoproteinTemperature distribution

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Area of Science:

  • Cardiovascular research
  • Biomedical engineering
  • Computational fluid dynamics

Background:

  • Abnormal low-density lipoprotein (LDL) accumulation contributes to aortic atherosclerosis.
  • The intricate relationship between aortic LDL transfer and hemodynamics requires further investigation.

Purpose of the Study:

  • To elucidate the mechanisms of heat and LDL transfer within healthy aortas.
  • To utilize a fluid-structure interaction (FSI) model for comprehensive analysis.

Main Methods:

  • Reconstructed two healthy aortic geometries from clinical CT angiography data.
  • Employed a two-way FSI model incorporating hyperelastic aortic wall properties (Yeoh model).
  • Integrated hemodynamic data and Windkessel models for boundary conditions.

Main Results:

  • High correlations (r > 0.914) observed for time-averaged LDL, temperature, and wall shear stress (WSS) between rigid and hyperelastic models, except for TSVI.
  • Positive correlation (r > 0.596) found between LDL concentration and aortic wall temperature.
  • Regions of long relative residual time (RRT) coincided with high LDL areas, negatively correlating with WSS and TSVI.

Conclusions:

  • Fluid-structure interaction is crucial for accurately predicting hemodynamic indices like OSI, RRT, and TSVI.
  • Findings provide insights into heat and LDL transfer mechanisms in healthy aortas.
  • Results may inform new strategies for measuring and regulating LDL accumulation.