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Related Concept Videos

Venous Return01:04

Venous Return

The circulatory system plays a crucial role in ensuring the optimal functioning of the human body. One of its critical components is venous return - the process that completes the blood circulation cycle. This article will delve into the concept of venous return, how it works, and its significance to our health.
What is Venous Return?
Venous return refers to the rate at which blood flows back to the heart from the body's peripheral veins. It's an integral part of the circulatory system as it...
Veins of Upper Limbs01:17

Veins of Upper Limbs

The human circulatory system, a marvel of biological engineering, is a complex network of vessels that transport blood throughout the body. Among these, the veins responsible for carrying blood from the upper limbs are divided into two categories: deep and superficial.
The deep venous system is primarily composed of the ulnar and radial veins. The ulnar vein, which drains the fingers through the superficial palmar venous arches, and the radial vein, which serves the palms via the deep palmar...
Veins as Blood Reservoirs01:10

Veins as Blood Reservoirs

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 vessels. When...
Veins of Lower Limbs01:15

Veins of Lower Limbs

The human body consists of an intricate network of veins responsible for the crucial task of blood drainage from the lower limbs. These veins can be categorized into two main types: deep veins and superficial veins.
Formed by the union of the medial and lateral plantar veins, the posterior tibial vein, rising through the calf muscle, assimilates the fibular vein. The anterior tibial vein, a superior extension of the foot's dorsalis pedis vein, merges with the posterior tibial vein at the knee,...
Overview of Systemic Veins01:11

Overview of Systemic Veins

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 middle...
Varicose Veins I: Introduction01:26

Varicose Veins I: Introduction

Varicose veins, or varicosities, are abnormally dilated and twisted superficial veins caused by venous valve incompetence. This condition commonly affects the lower extremities, especially the saphenous veins, due to the higher pressure from prolonged standing and walking. However, varicosities can also occur in other areas, such as the esophagus, vulva, spermatic cords, and anorectal region.Etiology and typesPrimary varicose veins, often idiopathic, are more common in women due to inherent...

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Related Experiment Video

Updated: Jun 1, 2026

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation
05:49

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation

Published on: May 16, 2025

Understanding Guyton's venous return curves.

Daniel A Beard1, Eric O Feigl

  • 1Department of Physiology, Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA. dbeard@mcw.edu

American Journal of Physiology. Heart and Circulatory Physiology
|June 14, 2011
PubMed
Summary
This summary is machine-generated.

Right atrial pressure does not limit cardiac output; instead, cardiac output is the independent variable. Guyton's model shows blood volume shifts, not pressure, explain observed changes in venous return.

More Related Videos

Anatomical Reconstructions of the Human Cardiac Venous System using Contrast-computed Tomography of Perfusion-fixed Specimens
06:02

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

Published on: April 18, 2013

Related Experiment Videos

Last Updated: Jun 1, 2026

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation
05:49

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation

Published on: May 16, 2025

Anatomical Reconstructions of the Human Cardiac Venous System using Contrast-computed Tomography of Perfusion-fixed Specimens
06:02

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

Published on: April 18, 2013

Area of Science:

  • Cardiovascular Physiology
  • Hemodynamics
  • Mathematical Modeling

Background:

  • Arthur Guyton proposed right atrial pressure limits venous return, a concept influencing decades of physiological understanding.
  • This interpretation has caused confusion by interchanging independent and dependent variables in cardiovascular models.

Purpose of the Study:

  • To reanalyze Guyton's model and data to clarify the relationship between arterial pressure, right atrial pressure, and cardiac output.
  • To delineate cardiac output as the independent variable in cardiovascular experiments.

Main Methods:

  • Reanalysis of Guyton's original mathematical model and experimental data.
  • Application of a constant blood volume assumption within the systemic circulation.

Main Results:

  • Increasing cardiac output, with a constant blood volume, leads to decreased right atrial pressure and increased arterial pressure.
  • Observed increases in right atrial pressure during decreased cardiac output result from blood volume redistribution, not a limitation on venous return.

Conclusions:

  • Right atrial pressure does not act as a back pressure limiting cardiac output or venous return.
  • Guyton's venous return curves have generated confusion and should be removed from educational materials.