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Related Concept Videos

Carbon Dioxide Transport in the Blood01:19

Carbon Dioxide Transport in the Blood

Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
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.
The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Facilitated Diffusion01:16

Facilitated Diffusion

The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...

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Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
11:55

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Published on: August 16, 2016

Carbon dioxide transport through membranes.

Andreas Missner1, Philipp Kügler2, Sapar M Saparov1

  • 1Institut für Biophysik, Linz A-4040, Austria.

The Journal of Biological Chemistry
|July 12, 2008
PubMed
Summary

Carbon dioxide (CO2) transport across cell membranes is primarily limited by unstirred layers, not membrane proteins like aquaporin-1 (AQP1). This research suggests protein facilitation of CO2 diffusion is unlikely, challenging previous hypotheses.

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Using Caco-2 Cells to Study Lipid Transport by the Intestine
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Using Caco-2 Cells to Study Lipid Transport by the Intestine

Published on: August 20, 2015

Area of Science:

  • Biophysics
  • Membrane Transport
  • Cell Physiology

Background:

  • Previous hypotheses suggested membrane channels like aquaporin-1 (AQP1) and RhAG facilitate carbon dioxide (CO2) transport.
  • The role of the lipid bilayer as a diffusion barrier for CO2 has not been experimentally confirmed.

Purpose of the Study:

  • To experimentally investigate the contribution of the lipid membrane to CO2 diffusion resistance.
  • To determine if membrane proteins significantly impact transmembrane CO2 flux.

Main Methods:

  • Monitoring transmembrane CO2 flux (JCO2) across planar lipid bilayers using pH shifts.
  • Employing an analytical model with carbonic anhydrase and buffer effects, fitted using inverse problem techniques.
  • Assessing CO2 permeability in epithelial cell monolayers with and without AQP1 overexpression.

Main Results:

  • At physiological pH (7.4), CO2 flux was limited by unstirred layers (USLs), indicating minimal membrane resistance.
  • Membrane lipid composition (sphingomyelin, cholesterol) did not affect CO2 flux.
  • At pH 9.6, membrane resistance contributed ~15% to total resistance, yielding a CO2 permeability of 3.2 ± 1.6 cm/s.
  • Cellular CO2 uptake at pH 7.4 is USL-limited due to USL size exceeding 1 µm.

Conclusions:

  • Transmembrane CO2 transport is predominantly limited by unstirred layers, not the lipid bilayer itself.
  • Facilitation of CO2 transport by proteins such as AQP1 and RhAG is unlikely under physiological conditions.
  • Experimental data from cell monolayers confirmed that AQP1 overexpression does not alter CO2 permeability.