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Related Concept Videos

Overview of Systemic and Pulmonary Circulation01:15

Overview of Systemic and Pulmonary Circulation

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The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
The oxygenated blood is sent...
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Autoregulation of Blood Flow01:17

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Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
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Acceleration due to Gravity on Other Planets01:24

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The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
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Overview of Pulmonary Circulation01:19

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The pulmonary circulation is a vital system in our body that acts as a bridge between the respiratory and cardiovascular systems. It serves as a transport network for deoxygenated blood from the heart to the lungs and then returns oxygen-rich blood back to the heart.
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Circular Orbits and Critical Velocity for Satellites01:16

Circular Orbits and Critical Velocity for Satellites

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The Moon orbits around the Earth. In turn, the Earth (and other planets) orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. One can examine the circular orbit, the simplest kind of orbit, to understand the relationship between the speed and the period of planets and satellites with respect to their positions and the bodies that they orbit.
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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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Related Experiment Video

Updated: Dec 9, 2025

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology
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Comprehensive Analysis of Macrocirculation and Microcirculation in Microgravity During Parabolic Flights.

Nana-Yaw Bimpong-Buta1, Johanna M Muessig1, Thorben Knost1

  • 1Medical Faculty, Division of Cardiology, Pulmonology, and Vascular Medicine, University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany.

Frontiers in Physiology
|September 9, 2020
PubMed
Summary

Microgravity altered seated blood pressure and cardiac output, but not microcirculation. Macrocirculatory changes occurred in seated positions, while microcirculation remained stable across all postures during parabolic flights.

Keywords:
hemodynamic changesmicrocirculationmicrogravityparabolic flightweightlessness

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Area of Science:

  • Cardiovascular Physiology
  • Space Medicine
  • Human Physiology

Background:

  • Understanding cardiovascular adaptations to microgravity is crucial for human space missions.
  • Previous research highlighted venous fluid shifts, but macrocirculatory and microcirculatory mechanisms remain unclear.

Purpose of the Study:

  • To investigate the effects of microgravity on macrocirculation and microcirculation.
  • To assess hemodynamic responses and sublingual microcirculation during parabolic flights.

Main Methods:

  • Twelve healthy volunteers underwent parabolic flights with alternating microgravity and hypergravity.
  • Sublingual microcirculation was assessed using intravital sidestream dark field microscopy.
  • Beat-to-beat analysis recorded heart rate, blood pressure, and cardiac output in seated and supine postures.

Main Results:

  • Seated systolic and diastolic blood pressure decreased, while cardiac output increased in microgravity compared to normal gravity.
  • These macrocirculatory changes were not observed in the supine posture.
  • Microcirculation, including perfused vessel proportion and total vessel density, remained unaffected by acute weightlessness.

Conclusions:

  • Significant macrocirculatory alterations occur in seated postures during microgravity exposure.
  • Microcirculation demonstrates stability across different postures and gravitational conditions.
  • Findings provide insights into cardiovascular adaptations relevant to spaceflight.