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Related Concept Videos

Aquaporins01:25

Aquaporins

4.9K
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
4.9K
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

516
In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
516
Glaucoma: Overview01:25

Glaucoma: Overview

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
674
Reabsorption and Secretion in the DCT and Collecting Duct01:26

Reabsorption and Secretion in the DCT and Collecting Duct

1.5K
The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal...
1.5K
Osmosis01:30

Osmosis

6.3K
Osmosis is the movement of free water molecules through a semipermeable membrane.  The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
Water, like other substances, moves from a high concentration of...
6.3K
Osmoregulation in Fishes02:32

Osmoregulation in Fishes

50.2K
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
50.2K

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Related Experiment Video

Updated: Aug 12, 2025

Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
09:03

Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye

Published on: June 20, 2015

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Aquaporins in Eye.

Thuy Linh Tran1, Steffen Hamann1, Steffen Heegaard1

  • 1Department of Ophthalmology, Rigshospitalet - Glostrup, University of Copenhagen, Copenhagen, Denmark.

Advances in Experimental Medicine and Biology
|January 30, 2023
PubMed
Summary
This summary is machine-generated.

Water movement is crucial for eye health, maintaining transparency and removing waste. Aquaporins (water channels) are key players in this vital ocular fluid transport system.

Keywords:
AquaporinsEyeWater transport

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Area of Science:

  • Ophthalmology
  • Physiology
  • Cell Biology

Background:

  • Water and ion transport are essential for maintaining ocular functions and health.
  • Metabolic waste removal and optical transparency depend on fluid dynamics within the eye.
  • The ciliary body secretes aqueous humor, regulating intraocular pressure.

Purpose of the Study:

  • To highlight the physiological significance of water and ion movement in the eye.
  • To emphasize the role of aquaporins in ocular fluid transport.
  • To explain how fluid transport impacts corneal transparency and retinal hydration.

Main Methods:

  • Review of existing literature on ocular fluid dynamics.
  • Analysis of the physiological roles of water channels in the eye.
  • Examination of aquaporin function in corneal, ciliary body, and retinal tissues.

Main Results:

  • Water movement is critical for removing metabolic byproducts from the cornea, ciliary body, lens, and retina.
  • Efficient transport across the corneal epithelium and endothelium is necessary for maintaining corneal transparency.
  • Aquaporins are identified as major facilitators of water transport across various ocular compartments.

Conclusions:

  • Continuous water and ion flux is pivotal for eye physiology, including waste removal and transparency maintenance.
  • Aquaporins play a significant role in regulating water transport throughout the eye.
  • Understanding these transport mechanisms is crucial for addressing ocular health and diseases.