Resistance Arteries
Resistance Arteries - Related Videos
10:54
A Cell Culture Model of Resistance Arteries
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Cited by 5 •
2017
A cell culture model of resistance arteries is described, allowing for the dissection of signaling pathways in endothelium, smooth muscle, or between endothelium and smooth muscle (the myoendothelial junction). The selective application of agonists or protein isolation, electron microscopy, or immunofluorescence can be utilized using this cell culture model.
07:25
Assessing Murine Resistance Artery Function Using Pressure Myography
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Cited by 18 •
2013
In pressure myography, an intact small segment of a vessel is mounted onto two small cannulas and pressurized to a suitable luminal pressure. Here, we describe the method to measure vasorelaxation response of the mouse 3rd order mesenteric arteries in c57 and sGCα1-/- mice using pressure myography.
10:48
Assessing Myogenic Response and Vasoactivity In Resistance Mesenteric Arteries Using Pressure Myography
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Cited by 24 •
2015
Pressure myography is used to assess vasoactivity of small arteries that develop sustained constriction when pressurized. This manuscript provides a detailed protocol to assess in isolated segments of small mesenteric arteries from rats, vasoactivity and the effect of intraluminal pressure on vascular diameter.
09:23
Isolation of Microvascular Endothelial Tubes from Mouse Resistance Arteries
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Cited by 20 •
2013
We present a preparation for visualizing and manipulating calcium signaling in native, intact microvascular endothelium. Endothelial tubes freshly isolated from mouse resistance arteries supplying skeletal muscle retain in vivo morphology and dynamic signaling within and between neighboring cells. Endothelial tubes can be prepared from microvessels of other tissues and organs.
10:28
Evaluation of Vascular Control Mechanisms Utilizing Video Microscopy of Isolated Resistance Arteries of Rats
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2017
This manuscript describes in vitro video microscopy protocols for evaluating vascular function in rat cerebral resistance arteries. The manuscript also describes techniques for evaluating microvessel density with fluorescently labeled lectin and tissue perfusion using Laser Doppler Flowmetry.
FAQs
Resistance increases sharply as the vessel radius decreases, so even modest smooth muscle contraction can substantially restrict flow. Conversely, relaxation widens the lumen and lowers resistance, allowing more blood to reach a tissue. This relationship explains how small vessels exert strong control over perfusion and why altered vascular tone can have important systemic consequences.
These inputs provide complementary control over smooth muscle activity. Sympathetic nerve activity and circulating hormones can adjust vessel constriction across the circulation, while local metabolites and endothelial signals help match flow to conditions within a tissue. Their combined effects determine whether a vascular bed narrows or widens and how blood is distributed among organs.
Local regulation allows a tissue to alter vascular tone according to its metabolic circumstances. When demand for oxygen changes, signals associated with the tissue can influence resistance artery diameter and therefore the amount of blood delivered. This local adjustment works alongside broader circulatory control, helping balance organ-specific perfusion with maintenance of systemic blood pressure.
Local control emphasizes where blood flows, allowing individual organs to adjust perfusion through metabolites and endothelial signals. Systemic regulation reflects broader influences, including sympathetic activity and circulating hormones, that affect vascular tone across the circulation. Resistance arteries connect these levels of control, so regional changes can redirect blood while coordinated widespread changes influence overall blood pressure.
Examining how these vessels respond to neural, hormonal, metabolic, and endothelial influences can clarify how tissues regulate perfusion. It can also show how abnormal vascular tone contributes to hypertension, ischemia, or shock. This makes resistance arteries useful for connecting mechanisms of blood-flow control with clinically important disturbances in circulation.
Because changes in their tone strongly influence vascular resistance, persistent constriction can contribute to elevated systemic blood pressure. Research focused on these vessels can therefore examine how altered smooth muscle regulation or signaling affects pressure control. The same work supports investigation of antihypertensive therapies intended to modify vascular tone and improve circulatory regulation.
These conditions involve problems with tissue perfusion, systemic circulation, or small-vessel function. Resistance arteries are relevant because their diameter determines how readily blood reaches organs and how flow is redistributed during changing physiological demands. Studying their regulation can help relate abnormal vascular responses to inadequate oxygen delivery, circulatory instability, and microvascular dysfunction.