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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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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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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.

Four main models that describe the relationship between ecosystem function and biodiversity. Four main models that describe the relationship between ecosystem function and biodiversity.
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Instructions for Completing the CMS-1500 (02/12) Claim Form Continued Instructions for Completing the CMS-1500 (02/12) Claim Form Continued
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Dose–response relationship. Dose–response relationship.
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Video: Humerus Adduction Animation

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