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Related Concept Videos

Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Bile01:19

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Bile is a crucial bodily fluid, characterized by its yellow-green color and alkaline nature. Produced in the liver, it is transported through the common hepatic duct into either the cystic duct, leading to the gallbladder, or directly into the common bile duct. The flow of bile is regulated by the sphincter of Oddi located at the entrance of the duodenum. When this sphincter is closed, bile is redirected to the gallbladder for storage and concentration.
Bile is released when dietary fats enter...
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Gallbladder01:17

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The gallbladder is a small, pear-shaped organ that plays a crucial role in our digestive system. Measuring about 10 cm in length, it is comparable in size to a kiwi fruit and is located in a hollow area on the lower surface of the liver. The gallbladder's primary function is to store and concentrate bile, a fluid produced by the liver that aids in digestion.
The gallbladder's anatomy consists of three regions: the fundus, body, and neck. Extending from the neck, the cystic duct joins...
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Pathophysiology of Peptic Ulcer Disease: Injurious Factors01:22

Pathophysiology of Peptic Ulcer Disease: Injurious Factors

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Peptic ulcers are sores on the stomach's inner lining and the upper small intestine, which are the result of disruptions in the mucosal layer that houses parietal cells which produce gastric acid, and chief cells which secrete pepsinogen.
In the antrum region, G cells secrete the gastrin hormone that binds to gastrin-cholecystokinin-B (CCK2) receptors on parietal and enterochromaffin-like (ECL) cells in the fundic glands. Simultaneously, the vagus nerve releases acetylcholine, which binds...
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Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
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Liver Physiology01:30

Liver Physiology

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The liver, an essential organ in the human body, performs over 200 vital functions that can be broadly categorized into metabolic, hematological, endocrine regulation, and bile production.
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Related Experiment Video

Updated: Oct 13, 2025

One-channel Cell-attached Patch-clamp Recording
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Piezo1 helps bile on the pressure.

Ben Short

    The Journal of General Physiology
    |November 10, 2021
    PubMed
    Summary

    A study reveals that the Piezo1-Pannexin1 complex in bile duct cells links osmotic pressure to ATP release. This discovery sheds light on cellular mechanosensation and signaling pathways.

    Area of Science:

    • Cell Biology
    • Physiology
    • Biochemistry

    Background:

    • Cholangiocytes, the epithelial cells lining bile ducts, play a crucial role in bile secretion and modification.
    • Osmotic pressure is a key regulator of cellular functions, but its direct coupling to signaling in cholangiocytes is not fully understood.

    Discussion:

    • The study identifies a novel mechanosensitive complex involving Piezo1 and Pannexin1 in cholangiocytes.
    • This complex acts as a sensor, translating mechanical stimuli (osmotic pressure) into biochemical signals (ATP secretion).

    Key Insights:

    • Piezo1, a known mechanosensitive ion channel, and Pannexin1, a channel protein, form a functional unit in cholangiocytes.
    • Osmotic gradients directly activate this complex, leading to the release of adenosine triphosphate (ATP) into the bile canaliculus.

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    Related Experiment Videos

    Last Updated: Oct 13, 2025

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    Outlook:

    • Further research can explore the role of this pathway in liver diseases associated with altered bile flow and pressure.
    • Targeting the Piezo1-Pannexin1 complex could offer new therapeutic strategies for cholestatic conditions.