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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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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.
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The subclavian artery transitions into the axillary artery as it exits the chest and enters the axillary region. This artery is critical for supplying blood to the shoulder area, including the head of the humerus, through the humeral circumflex arteries. As the vessel continues into the upper arm or brachium, it becomes the brachial artery. This artery plays a key role in vascularizing the brachial region and bifurcates at the elbow into several branches. These branches include the deep...
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Arteries, the vasculature responsible for transporting blood from the heart, possess robust walls capable of enduring the elevated pressures exerted by the heartbeat. Arteries near the heart are especially thick-walled and enriched with elastic fibers across their three tunics, classifying them as elastic or conducting arteries. These arteries, usually with a diameter exceeding 10 mm, are characterized by their ability to dilate in response to the blood pumped from the heart's ventricles...
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The human body's intricate network of arteries ensures that every organ system receives the necessary oxygen and nutrients for optimal function. The arterial network in the head and neck region is particularly complex, providing vital blood flow to the brain, eyes, and other critical structures. Prominent arteries in this region include the internal carotid arteries and the vertebral arteries.
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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.
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Updated: Dec 18, 2025

Assessment of Global Ocular Structure Following Spaceflight Using a Micro-Computed Tomography Micro-CT Imaging Method
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Arterial structure and function during and after long-duration spaceflight.

Stuart M C Lee1, L Christine Ribeiro1, David S Martin1

  • 1KBR, Houston, Texas.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|June 12, 2020
PubMed
Summary
This summary is machine-generated.

Long-duration spaceflight increases oxidative stress and inflammation in astronauts, but does not cause lasting cardiovascular changes. Arterial structure and function remained stable, suggesting low Earth orbit missions may not pose long-term cardiovascular risks.

Keywords:
cardiovascular disease riskcarotid intima-media thicknessflow-mediated dilationinflammationoxidative stress

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Area of Science:

  • Space medicine
  • Cardiovascular physiology
  • Human physiology in space

Background:

  • Spaceflight is associated with oxidative stress and inflammation, potentially accelerating cardiovascular disease.
  • Understanding the impact of long-duration spaceflight on astronaut cardiovascular health is crucial for mission safety.

Purpose of the Study:

  • To investigate structural and functional changes in carotid and brachial arteries during long-duration spaceflight (>4 months).
  • To assess the relationship between spaceflight-induced oxidative stress, inflammation, and cardiovascular parameters.

Main Methods:

  • Measured common carotid artery (CCA) intima-media thickness (cIMT), distensibility, and stiffness in 13 astronauts before, during, and after spaceflight.
  • Assessed brachial artery vasodilation (endothelium-dependent and -independent) and biomarkers of oxidative stress and inflammation.

Main Results:

  • Biomarkers of oxidative stress and inflammation increased during spaceflight but largely returned to preflight levels post-landing.
  • No significant changes in CCA structure (cIMT) or mechanical properties (stiffness, distensibility) were observed.
  • Brachial artery vasodilation remained unchanged, and overall arterial structure and function were not significantly altered by spaceflight.

Conclusions:

  • Long-duration spaceflight in low Earth orbit does not appear to induce significant long-term cardiovascular health risks in healthy astronauts.
  • While oxidative stress and inflammation markers rise during missions, arterial adaptations were not detected, suggesting resilience.
  • Further research is needed for extended missions with higher radiation and altered gravity.