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Related Concept Videos

Coronary Circulation01:21

Coronary Circulation

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The heart, an organ critical to survival, gets nourishment not from the blood it pumps but from a separate circulation system known as coronary circulation. This is the shortest circulation in the body and is responsible for supplying the heart with the nutrients it needs to function effectively.
Coronary circulation begins at the base of the aorta, where two main arteries arise—the left and right coronary arteries. These arteries encircle the heart in the coronary sulcus and supply the...
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Overview of Systemic Veins01:11

Overview of Systemic Veins

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Systemic veins are crucial blood vessels that return deoxygenated blood from various body tissues back to the heart. There are three systemic veins that return deoxygenated blood to the heart, they are as follows.
The coronary sinus, the heart's principal vein, resides in the coronary sulcus on the heart's posterior aspect. This broad venous channel receives nearly all venous blood from the myocardium, the heart muscle. It is fed by three primary veins: the great cardiac vein, the...
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Blood Flow01:29

Blood Flow

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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.
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Veins01:17

Veins

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Veins are an integral part of our circulatory system, serving as the blood vessels that transport blood from all body regions to the heart. They are a network of hollow tubes that carry blood low in oxygen from the body's cells back to the heart for reoxygenation. Veins are crucial for maintaining the body's overall fluid balance and the continuous circulation of blood.
Structure of Veins:
The structure of veins is specifically designed to assist in the low-pressure transportation of...
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Veins as Blood Reservoirs01:10

Veins as Blood Reservoirs

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Veins, while chiefly responsible for circulating blood back to the heart, also function as storage vessels for blood. They house approximately 64 percent of the body's total blood volume, a feat made possible by their high capacitance—the inherent ability to expand and accommodate large volumes of blood, even under low pressure. The large diameter and thin walls of veins augment their distensibility, significantly more so than arteries, due to their classification as capacitance...
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Structure of Blood Vessels01:15

Structure of Blood Vessels

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Blood is circulated throughout the human body through a network of blood vessels called the circulatory system. This system includes arteries that transport blood from the heart to various body parts. These arterial pathways divide into smaller vessels until they reach the arterioles, which further split into capillaries. It is within these minuscule capillaries that the exchange of nutrients and waste products takes place. After this exchange, the blood is collected by venules, which fuse to...
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Related Experiment Video

Updated: Mar 13, 2026

Particle Image Velocimetry Investigation of Hemodynamics via Aortic Phantom
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Flow velocity is relatively uniform in the coronary sinusal venous tree: structure-function relation.

Hao Wu1,2, Ghassan S Kassab3, Wenchang Tan4,2,5

  • 1Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, People's Republic of China.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 1, 2016
PubMed
Summary

The coronary venous system, unlike arteries, follows an area-preserving rule for efficient blood return. This hemodynamic model provides a reference for understanding coronary venous circulation and interventions.

Keywords:
area preservationcoronary venous circulationhemodynamicsmorphometry

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Anatomical Reconstructions of the Human Cardiac Venous System using Contrast-computed Tomography of Perfusion-fixed Specimens
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Area of Science:

  • Cardiovascular Physiology
  • Hemodynamics
  • Anatomical Modeling

Background:

  • Coronary venous vessel structure and function are poorly understood compared to arteries.
  • Coronary sinus interventions highlight the therapeutic significance of venous pathways.
  • Understanding coronary venous circulation is crucial for cardiovascular research.

Purpose of the Study:

  • To perform a hemodynamic analysis of the entire coronary sinusal venous tree.
  • To enhance the understanding of coronary venous circulation dynamics.
  • To establish a physiological reference for testing therapeutic strategies.

Main Methods:

  • Developed a hemodynamic model of the coronary sinusal venous tree.
  • Reconstructed the model using casts and histological data from swine hearts.
  • Analyzed morphometric and hemodynamic parameters using the Strahler system.

Main Results:

  • Demonstrated area preservation in the coronary venous system, leading to uniform flow velocity.
  • Observed abrupt decreases in pressure and wall shear stress from venules to order -5 vessels.
  • Identified order -5 vessels as a hemodynamic transition zone.
  • Coronary sinusal venous system complies with the area-preserving rule (da Vinci's rule).

Conclusions:

  • The coronary venous system adheres to area preservation for efficient venous return.
  • This contrasts with the coronary arterial tree's adherence to the minimum energy hypothesis.
  • The developed model serves as a reference for evaluating venous-route therapies.