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Related Concept Videos

Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
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Transcellular Transport of Solutes01:23

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Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
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Microtubule Associated Motor Proteins01:32

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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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Transport Across the Golgi01:26

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While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
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Cystic Fibrosis: Management01:24

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Cystic fibrosis (CF) is an autosomal recessive disorder that predominantly affects individuals of Northern European descent, occurring at a rate of 1 in 3500. It is caused by a genetic mutation in a gene on chromosome 7, most commonly the ΔF508 mutation, that codes for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. This results in thicker mucus secretions and obstruction pathologies in multiple organs, including the lungs and sinuses.
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Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
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Related Experiment Video

Updated: Dec 24, 2025

Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer
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Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer

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On mucociliary transport.

A Silberberg1

  • 1Department of Polymer Research, Weizmann Institute of Science, Rehovot, Israel.

Biorheology
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

Mucus rheology is key for efficient ciliary transport. Its elastic properties aid momentum transfer, while low viscosity ensures fast mucus secretion, balancing transport needs.

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Related Experiment Videos

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Area of Science:

  • Biophysics
  • Rheology
  • Cell Biology

Background:

  • Cilia propel mucus layers in various biological systems.
  • Understanding mucus rheology is crucial for effective clearance mechanisms.

Purpose of the Study:

  • Analyze mucus flow patterns between ciliary tips and transported load.
  • Estimate energy dissipation per cilium in mucus and periciliary fluid.
  • Investigate the role of mucus elasticity and viscosity in transport.

Main Methods:

  • Analysis of periodically changing flow patterns.
  • Estimation of energy dissipation rates.
  • Evaluation of rheological properties (elasticity, viscosity).

Main Results:

  • Energy supply to cilia far exceeds energy loss rates.
  • Mucus elasticity is vital for momentum transfer and load carrying.
  • Low elasticity and viscosity are desired for rapid mucus secretion.

Conclusions:

  • Mucus rheological properties represent a compromise between transport efficiency and secretion speed.
  • Optimized mucus rheology is essential for effective biological clearance.