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Overview of the Cardiovascular System

Overview of the Cardiovascular System

The cardiovascular system is a vital transportation system in the body. It comprises the heart and blood vessels and facilitates the exchange of gases, nutrients, and waste products.
Heart
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Blood and lymph are fluid connective tissues. They contain cells, also known as formed elements, circulating in a liquid extracellular matrix, the plasma. The formed elements are derived from hematopoietic stem cells in the bone marrow. Blood and lymph connect all vital parts and carry nutrients, oxygen, and other essential molecules like antibodies.
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The blood flows through blood vessels— arteries, capillaries, and veins. Blood plasma is primarily made of proteins, solutes, and water.

Anatomy of the Circulatory System

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The human circulatory system consists of blood, blood vessels that carry blood away from the heart, around the body, and back to the heart, and the heart itself, which acts as a central pump. The systemic circuit supplies blood to the whole body, the coronary circuit supplies blood to the heart, and the pulmonary circuit supplies blood flow between the heart and lungs.

Fluid Movement Between Compartments

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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...

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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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Related Experiment Video

Updated: Jun 1, 2026

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

Published on: April 25, 2013

Biofluid mechanics and the circulatory system.

Pascal Verdonck¹, Kris Dumont

¹Institute Biomedical Technology, Ghent University, Belgium. pascal.verdonck@ugent.be

Technology and Health Care : Official Journal of the European Society for Engineering and Medicine

|May 26, 2011

Summary

Biofluid mechanics applies fluid dynamics principles to biological systems like the cardiovascular system. Understanding blood flow, pressure, and velocity is crucial for analyzing heart valve function.

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Area of Science:

Cardiovascular science
Fluid dynamics
Biomedical engineering

Background:

A fluid deforms continuously under shear stress, encompassing liquids and gases.
Biofluid mechanics integrates anatomical, geometrical, and physiological data for cardiovascular analysis.
Assessing the hemodynamics of biological and mechanical heart valves serves as a key application.

Purpose of the Study:

To highlight the importance of biofluid mechanics in cardiovascular research.
To outline the necessary data for applying biofluid mechanics to the cardiovascular system.
To provide an example of hemodynamic assessment in heart valve research.

Main Methods:

Integration of anatomical and geometrical data.
Analysis of pressure, blood flow, volume, and velocity measurements.
Hemodynamic assessment of biological and mechanical heart valves.

Main Results:

Demonstrated the application of fluid dynamics principles to cardiovascular systems.
Established the necessity of comprehensive data for biofluid mechanics analysis.
Provided a framework for evaluating heart valve hemodynamics.

Conclusions:

Biofluid mechanics is essential for understanding cardiovascular function.
Accurate data on anatomy, geometry, and blood flow dynamics are critical.
Hemodynamic assessment of heart valves is a vital area of study.