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Related Concept Videos

Blood Flow01:29

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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Blood Pressure Imbalances and Circulatory Shock01:24

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Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...
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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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Introduction to Hemostasis01:05

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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
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Blood Pressure01:24

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The movement of blood in a human body, commonly referred to as blood flow, is determined by the volume of blood that traverses a certain section of the bodily system per unit time. It is the rhythmic contraction of the heart's ventricles that primarily instigates this movement. As the ventricles contract, blood is forced into the prominent arteries, which then flow from areas of greater pressure to lower pressure areas. This movement continues into smaller arteries and arterioles and...
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Blood Pressure01:30

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Blood pressure (BP) is the pressure or force of blood exerted on the artery's walls as it circulates through the body. It is essential for maintaining blood flow throughout the body.
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Integrated Compensatory Responses in a Human Model of Hemorrhage
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Hemodynamics.

Timothy W Secomb1

  • 1Department of Physiology, University of Arizona, Tucson, Arizona.

Comprehensive Physiology
|April 12, 2016
PubMed
Summary
This summary is machine-generated.

This review covers physical principles of blood flow and pressure distribution in vessels. Understanding hemodynamics, including blood properties and vessel mechanics, is crucial for circulatory system function and disease.

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Area of Science:

  • Physiology
  • Biophysics
  • Cardiovascular Science

Background:

  • The circulatory system's function relies on complex interactions between blood flow, pressure, and vessel properties.
  • Understanding these hemodynamics is key to comprehending cardiovascular health and disease.

Purpose of the Study:

  • To review the fundamental physical principles governing blood flow and pressure distribution within the vascular system.
  • To highlight the interplay of cardiac output, blood rheology, and vascular architecture.

Main Methods:

  • This review synthesizes existing knowledge on fluid dynamics applied to the cardiovascular system.
  • It examines the roles of pulsatile pressure, blood viscosity, inertia, and vessel biomechanics.

Main Results:

  • Blood flow and pressure dynamics are influenced by heart's pulsatile output, blood's flow characteristics, and vessel geometry/properties.
  • Flow phenomena vary significantly with vessel size, from pulse wave propagation in arteries to cell suspension effects in microcirculation.
  • Vessel wall stresses from flow and pressure trigger biological responses influencing vascular control and remodeling.

Conclusions:

  • Hemodynamics, encompassing fluid dynamics and biomechanics, is essential for understanding cardiovascular system operation.
  • Knowledge of these physical principles is vital for addressing cardiovascular diseases like hypertension and atherosclerosis.