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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

Malpighian tubules from the excretory system of an insect. Malpighian tubules from the excretory system of an insect.
The lymphatic system in humans. The lymphatic system in humans.
Erythroblastosis fetalis. (a) The condition occurs with an RH+ father and RH– mother. (b) First preg Erythroblastosis fetalis. (a) The condition occurs with an RH+ father and RH– mother. (b) First preg
Circulatory System Circulatory System
Organs of the Digestive System Organs of the Digestive System
Limbic System Components Limbic System Components
Video: Role of the respiratory system - effect of altered ventilation rates

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