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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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Anatomy of Blood Vessels01:20

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The vascular system, an integral part of the circulatory system, comprises various blood vessels that play crucial roles in maintaining the body's homeostasis. These blood vessels form a complex and efficient circulatory network. The three primary categories of blood vessels are the arteries, veins, and capillaries.
Arteries
Arteries circulate oxygenated blood from the heart, except the pulmonary artery, which transports deoxygenated blood to the lungs. Large arteries, such as the aorta,...
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Oxygen Transport in the Blood01:27

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
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Overview of Blood Vessels01:14

Overview of Blood Vessels

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The human cardiovascular system comprises five primary types of blood vessels: arteries, arterioles, veins, venules, and capillaries, each serving unique functions.
Arteries and Arterioles: Arteries are muscular and elastic vessels that primarily carry oxygenated blood from the heart to body tissues, except for the pulmonary artery, which carries deoxygenated blood. They have thick walls to withstand high pressure and contain a layer of muscle tissue, allowing them to expand or contract as...
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The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.
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Related Experiment Video

Updated: Feb 8, 2026

En Face Preparation of Mouse Blood Vessels
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Interaction between oxygen and the blood vessel wall.

R N Pittman

    The Canadian Journal of Cardiology
    |March 1, 1986
    PubMed
    Summary

    Blood vessels sense oxygen levels to regulate blood flow. While studies suggest endothelial cells play a key role, direct oxygen effects on vessels in vivo require further investigation.

    Area of Science:

    • Physiology
    • Vascular Biology
    • Oxygen Sensing Mechanisms

    Background:

    • Blood vessels in vivo adjust to oxygen supply and demand.
    • The direct impact of oxygen on vessels involved in vasoregulation is not fully understood.
    • Existing research primarily uses isolated large vessel preparations.

    Purpose of the Study:

    • To investigate whether blood vessels are directly affected by oxygen levels in vasoregulatory responses.
    • To explore the mechanisms underlying oxygen sensing in blood vessels.
    • To evaluate the role of endothelial cells in vascular oxygen sensing.

    Main Methods:

    • Analysis of oxygen sensitivity in isolated blood vessel preparations (strips, rings, segments).
    • Assessment of oxygen partial pressure (PO2) thresholds for vascular responses.

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  • Investigation of potential involvement of chemical mediators like adenosine and prostacyclin.

    • Main Results:

    • Isolated vessel preparations show sensitivity to a wide range of oxygen partial pressures (PO2).
    • Reduced energy production due to hypoxia is unlikely to be the sole cause of relaxation.
    • Evidence points towards oxygen-linked chemical mediators and a significant role for endothelial cells.

    Conclusions:

    • Oxygen sensing in blood vessels involves complex mechanisms beyond simple energy production.
    • Endothelial cells are likely crucial sites for vascular oxygen detection.
    • Extrapolation of findings from large vessels to in vivo microvessels requires caution.