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Related Concept Videos

Capillary Exchange01:28

Capillary Exchange

The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular clefts.
Capillary Beds01:20

Capillary Beds

Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
Capillaries connect arterioles, small branches of arteries, to venules,...
Capillaries and Their Types01:20

Capillaries and Their Types

Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists, with...
Capillarity in Fluid01:19

Capillarity in Fluid

Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
Respiration and Gaseous Exchange01:20

Respiration and Gaseous Exchange

The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves the...
Gas Exchange and Transport01:20

Gas Exchange and Transport

Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.

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Ex Vivo Pressurized Hippocampal Capillary-Parenchymal Arteriole Preparation for Functional Study
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Ex Vivo Pressurized Hippocampal Capillary-Parenchymal Arteriole Preparation for Functional Study

Published on: December 18, 2019

Transcapillary exchange in relation to capillary circulation.

E M Renkin1

  • 1Department of Physiology and Pharmacology, Duke University, Durham, North Carolina 27706.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Vascular smooth muscle controls blood-tissue transport by regulating capillary blood flow and surface area. Vasomotor mechanisms significantly impact solute exchange in tissues like skeletal muscle.

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Area of Science:

  • Physiology
  • Microcirculation
  • Transport Phenomena

Background:

  • Transcapillary exchange of solutes relies on capillary blood flow (Q), permeability (P), and surface area (S).
  • Solute equilibration in capillaries is influenced by the Q/PS ratio and the number/distribution of open capillaries in microvascular beds.

Purpose of the Study:

  • To investigate the role of vascular smooth muscle and vasomotor mechanisms in controlling transcapillary exchange.
  • To determine the extent of control exerted by these mechanisms on blood-tissue transport.

Main Methods:

  • Experimental studies measuring effective capillary filtration coefficient (PS) using radioactive tracers like potassium-42 ((42)K) or rubidium-86 ((86)Rb).
  • Analysis of changes in PS under varying conditions of nervous vasoconstriction and metabolic vasodilation in skeletal muscle.

Main Results:

  • Vasomotor mechanisms demonstrate significant control over blood-tissue transport, with effective PS varying up to 8-fold.
  • Changes in functional capillary surface area and blood flow distribution are the most likely drivers of these observed variations in PS.

Conclusions:

  • Vascular smooth muscle, via precapillary sphincters, effectively regulates transcapillary exchange by altering capillary recruitment and blood flow distribution.
  • While changes in functional surface area and flow distribution significantly impact solute exchange, the contribution of variations in capillary permeability itself remains undetermined.