Precapillary resistance

Precapillary resistance
Illustration of a capillary system with precapillary sphincters, which are the regulators of precapillary resistance in the mesenteric circulation.
*Anatomical terminology* [edit on Wikidata]

Precapillary resistance is the modulation of blood flow by capillaries through vasomotion, either opening (dilating) and letting blood pass through, or by constricting their lumens, reducing bloodflow through the capillary bed (occluding the passage of blood). It is not entirely clear how precapillary resistance is created in many parts of the body.^[1] Precapillary sphincters are smooth muscle structures that mediate the precapillary resistance in the mesenteric microcirculation.^[1]

References

1 2 Sakai T, Hosoyamada Y (September 2013). "Are the precapillary sphincters and metarterioles universal components of the microcirculation? An historical review". The Journal of Physiological Sciences 63 (5): 319–31. doi:10.1007/s12576-013-0274-7. PMC 3751330. PMID 23824465.

Arteries and veins

Vessels

Arteries	Nutrient artery Arteriole Metarteriole

Capillaries	Types Continuous Fenestrated Sinusoidal Precapillary sphincter Precapillary resistance

Veins	Vena comitans Superficial vein Deep vein Emissary veins Venous plexus Venule

Lymph	Lymphatic vessel Lymph Lymph capillary

Circulation

Systemic	Left heart → Aorta → Arteries → Arterioles → Capillaries → Venules → Veins → Vena cava → (Right heart)

Pulmonary	Right heart → Pulmonary arteries → Lungs → Pulmonary vein → Left heart

Microanatomy

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Precapillary resistance

See also

References