Physiology of arterioles

Arterioles are unique for the have the highest level of relative resistance of all vessels and are generously innervated.

Arteriolar luminal size may be under the influence of many factors as follows

Table on summary of factor affecting the arteriolar size, After Ganong, (1987)

Arteriolar constriction Arteriolar dilatation
  • Increased noradrenergic discharge
  • Circulating catecolamines (except epinephrine in skeletal muscle and liver)
  • Circulating angiotensin II
  • Locally released serotonin
  • Decreased local temperature
  • Decreased noradrenergic discharge
  • Circulating epinephrine in skeletal muscle and lover
  • Activation of cholinergic dilators in skeletal muscle
  • Histamine
  • Kinins
  • Axon reflex
  • Decreased O2 tension
  • Increased CO2 tension
  • Decreased pH
  • Lactate, K, adenosine, etc
  • Increased local temperature
       


 



Blood vessels physiology    

Mean velocity, blood pressure, relative resistance, total cross-sectional area in all blood vessels from aorta to vein.

 

 

 

 

 

 

 

 

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