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Related Concept Videos

Diffusion01:12

Diffusion

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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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Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Esophageal Varices-I: Introduction01:24

Esophageal Varices-I: Introduction

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Esophageal varices are dilated, tortuous veins which are found mainly in the submucosa of the lower esophagus but which may also appear higher up or extend into the stomach. They develop due to increased pressure in the portal venous system, often as a result of liver cirrhosis. This condition scars and damages the liver, impeding normal blood flow through the portal vein. To compensate, blood seeks alternative pathways, forming fragile new vessels (varices) in the esophagus and stomach. These...
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Esophageal Perforation-I: Introduction01:22

Esophageal Perforation-I: Introduction

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Esophageal perforation is a severe medical condition characterized by a breach in the integrity of the esophageal wall. This breach can occur due to various factors such as trauma, medical procedures, or underlying diseases. When the esophageal wall is compromised, it allows food, fluids, and digestive juices into the chest cavity or adjacent structures, leading to potential complications and health risks.
The location of esophageal perforation can vary, occurring anywhere along the esophagus....
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Esophageal Strictures-I: Introduction01:30

Esophageal Strictures-I: Introduction

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Esophageal strictures involve abnormal narrowing or tightening of the esophagus. They vary in length and severity, ranging from mild constriction to complete obstruction, and are classified as benign (noncancerous) or malignant (cancerous).
Etiology
The primary cause of esophageal strictures is long-standing gastroesophageal reflux disease (GERD), accounting for about 70 to 80% of adult cases. Chronic acid reflux can lead to injury and scarring of the esophageal lining, culminating in...
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Facilitated Diffusion01:16

Facilitated Diffusion

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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...
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Related Experiment Video

Updated: Jan 25, 2026

Author Spotlight: Improving Lesion Contiguity in Pulmonary Vein Isolation via Proactive Esophageal Cooling
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Diffuse intramural esophageal pseudodiverticulosis.

R Eliakim, E Libson, D Rachmilewitz

    Journal of the National Medical Association
    |January 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Diffuse intramural pseudodiverticulosis is a rare cause of esophageal dysphagia. Diagnosis relies on barium swallow review, with treatment focusing on stricture dilation and inflammation management.

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    Area of Science:

    • Gastroenterology
    • Esophageal Diseases

    Background:

    • Diffuse intramural pseudodiverticulosis (DIP) is an uncommon esophageal condition.
    • It presents as a rare cause of dysphagia and food impaction.

    Observation:

    • A case study of a 19-year-old patient with a history of recurrent food impaction is presented.
    • The patient was diagnosed with diffuse intramural pseudodiverticulosis.

    Findings:

    • Barium swallow examination is crucial for diagnosing DIP.
    • The imaging findings are key to identifying this rare esophageal condition.

    Implications:

    • Treatment strategies include dilating esophageal strictures.
    • Managing inflammation is also a critical component of patient care.