Related Experiment Videos
Microvascular filling pattern in rat liver sinusoids during vagal stimulation
The Journal of Physiology
|October 1, 1979
Summary
Vagal nerve stimulation in rats dilates liver sinusoids and increases their number, but erythrocyte flow velocity decreases. Overall liver blood flow remains constant due to recruitment and distension of sinusoids.
Area of Science:
- Physiology
- Microcirculation
- Hepatology
Background:
- The liver's microcirculation is crucial for its metabolic and detoxification functions.
- Understanding how neural pathways influence liver hemodynamics is essential for comprehending liver physiology.
Purpose of the Study:
- To investigate the effects of vagal nerve stimulation on rat liver microcirculation.
- To quantify changes in liver sinusoid diameter, erythrocyte flow velocity, and sinusoidal capacity.
Main Methods:
- Utilized a video-microscope system to observe and record terminal liver microcirculation in rats.
- Calculated volumetric flow rate using sinusoid diameter and erythrocyte flow velocity.
- Stimulated vagus nerves to assess hemodynamic responses.
Main Results:
- Vagal stimulation caused liver sinusoid dilation and decreased erythrocyte flow velocity.
- Total volumetric flow per microscopic field remained unchanged.
- Sinusoidal recruitment (opening closed sinusoids) accounted for two-thirds of increased capacity, with distension of existing sinusoids contributing the remaining third.
Conclusions:
- Vagal stimulation alters liver sinusoid dynamics by increasing sinusoidal capacity through recruitment and distension.
- Despite individual sinusoid changes, overall liver blood flow is maintained, suggesting a regulatory mechanism.