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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Purpura, hemorrhaging into the skin due to fragile blood vessels. Purpura, hemorrhaging into the skin due to fragile blood vessels.
Examples of Ways That Different Types of Intersections of Two Line Segments Can Be Transformed into Examples of Ways That Different Types of Intersections of Two Line Segments Can Be Transformed into
Types of muscle tissue. Types of muscle tissue.
Classification of Skin Disorders Classification of Skin Disorders
Cutaneous granulomatous lesions on the face of a man suffering from a dermatophytic infection. Cutaneous granulomatous lesions on the face of a man suffering from a dermatophytic infection.
Trapezoidal rule (approximation with four rectangles) Trapezoidal rule (approximation with four rectangles)
Video: Mechanisms of capillary exchange (transcytosis & bulk flow)

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