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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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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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Asthma cases in Americans are about 75% higher today than they were in 1980.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Total fertility rates (TFRs) among major regions of the world. Total fertility rates (TFRs) among major regions of the world.
Tissues and Regions of the Root Tip Tissues and Regions of the Root Tip
Far Oceania was the last of the regions of the world to be colonized by humans. Far Oceania was the last of the regions of the world to be colonized by humans.
Regions of the Human Visual Cortex and Their Functions Regions of the Human Visual Cortex and Their Functions
Global Soil Regions Global Soil Regions
Major bone (tan) and cartilage (light blue) elements of the human skeleton. Inset shows regions of v Major bone (tan) and cartilage (light blue) elements of the human skeleton. Inset shows regions of v
Video: Chemical Buffers - protein buffer, phosphate buffer system and bicarbonate buffer system

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