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Related Concept Videos

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 the Circulatory System02:03

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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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Arteries of the Upper Limbs01:12

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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 of the Head and Neck01:26

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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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Overview of Blood Vessels01:14

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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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Arteries and Arterioles01:16

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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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Related Experiment Video

Updated: Jun 12, 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 in the years after long-duration spaceflight.

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

  • 1KBR, Houston, Texas, United States.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 30, 2025
PubMed
Summary

Long-duration spaceflight did not cause lasting cardiovascular changes in astronauts up to five years post-mission. Studies show no significant differences in artery structure or function after space travel, indicating good cardiovascular health in astronauts.

Keywords:
cardiovascular diseasecarotid intima-media thicknessflow-mediated vasodilationinflammationoxidative stress

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Area of Science:

  • Cardiovascular Physiology
  • Space Medicine
  • Astronaut Health

Background:

  • Spaceflight poses risks of oxidative stress and inflammation, potentially accelerating cardiovascular disease.
  • Understanding the long-term cardiovascular impact of space missions is crucial for astronaut health.
  • Previous research focused on immediate post-flight cardiovascular status.

Purpose of the Study:

  • To determine if long-duration spaceflight (>4 months) induces structural and functional changes in carotid and brachial arteries years after landing.
  • To assess the long-term cardiovascular health of astronauts post-International Space Station (ISS) missions.

Main Methods:

  • Measured common carotid artery (CCA) intima-media thickness (cIMT), distensibility, and stiffness in 13 ISS astronauts before and up to 5 years after flight.
  • Assessed brachial artery endothelial-dependent and -independent vasodilation pre- and post-flight.
  • Reviewed astronaut health records for cardiovascular parameters from NASA archives.

Main Results:

  • No significant differences were found in postflight cIMT, CCA stiffness, distensibility, or brachial artery vasodilation compared to preflight measurements up to 5 years after landing.
  • No newly diagnosed cardiovascular diseases were recorded in the studied astronaut cohort within the 5-year post-flight period.
  • Biomarkers of oxidative stress and inflammation show dynamic changes post-landing but may not reflect long-term health consequences.

Conclusions:

  • Long-duration spaceflight on the ISS did not lead to adverse structural or functional changes in the carotid and brachial arteries within 5 years post-flight.
  • Astronauts did not exhibit increased carotid artery wall thickness, stiffness, or endothelial dysfunction in the years following space missions.
  • Continued long-term surveillance is essential for assessing lifetime cardiovascular risk, especially for future deep space missions.