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Related Concept Videos

Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
Model Approaches for Pharmacokinetic Data: Physiological Models01:15

Model Approaches for Pharmacokinetic Data: Physiological Models

Physiological models in pharmacokinetics are instrumental in understanding the distribution and elimination of drugs within the body. These models describe the drug concentration within target organs, influenced by factors such as drug uptake, tissue volume, and blood flow. Drug uptake is governed by the partition coefficient, which signifies the drug concentration ratio in tissue to that in the blood. The blood flow rate to a specific tissue is expressed as Qt, and the rate of change in tissue...
Pharmacokinetic Models: Overview01:20

Pharmacokinetic Models: Overview

Pharmacokinetic models utilize mathematical analysis to achieve a detailed quantitative understanding of a drug's life cycle within the body. They are instrumental in simulating a drug's pharmacokinetic parameters, predicting drug concentrations over time, optimizing dosage regimens, linking concentrations with pharmacologic activity, and estimating potential toxicity.
There are three primary types of models: empirical, compartment, and physiological. Empirical models, with minimal assumptions,...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

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.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

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Related Experiment Video

Updated: Jul 3, 2026

En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries
08:58

En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries

Published on: February 25, 2016

Nitric oxide bioavailability in the microcirculation: insights from mathematical models.

Nikolaos M Tsoukias1

  • 1Department of Biomedical Engineering, Florida International University, Miami, Florida 33174, USA. tsoukias@fiu.edu

Microcirculation (New York, N.Y. : 1994)
|July 9, 2008
PubMed
Summary

Mathematical modeling helps answer key questions about nitric oxide (NO) signaling in the microcirculation. These models explore NO

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Last Updated: Jul 3, 2026

En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries
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Published on: February 25, 2016

Analytical Techniques for Assaying Nitric Oxide Bioactivity
11:28

Analytical Techniques for Assaying Nitric Oxide Bioactivity

Published on: June 18, 2012

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Area of Science:

  • Physiology
  • Biophysics
  • Computational Biology

Background:

  • Nitric oxide (NO) is a crucial signaling molecule regulating microcirculatory tone.
  • Despite extensive research, fundamental questions about NO's role in microcirculation persist.
  • Experimental limitations hinder precise quantification of vascular NO concentrations.

Purpose of the Study:

  • To explore the utility of mathematical modeling in investigating microcirculatory NO physiology.
  • To address experimental limitations in quantifying NO concentrations within the vasculature.
  • To examine mechanisms affecting NO availability in health and disease.

Main Methods:

  • Development and application of mathematical models of NO dynamics in the vasculature.
  • Incorporation of increasing complexity and detail into NO transport and reaction models.
  • Investigation of NO interactions with heme proteins and reactive oxygen species.

Main Results:

  • Mathematical models are increasingly used to study NO fate in the vasculature.
  • Models explore NO release from nonendothelial sources and transient release effects.
  • Models facilitate hypothesis testing for NO-dependent signaling mechanisms.

Conclusions:

  • Mathematical modeling is a valuable tool for advancing the understanding of NO in microcirculation.
  • Models can elucidate complex NO interactions and regulatory mechanisms.
  • Computational approaches are essential for generating and testing hypotheses in NO physiology.