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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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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

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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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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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There are 20 feet of blood vessels in each square inch of human skin.

Summary of events in the killing of virus-infected cells by cytotoxic T cells. Summary of events in the killing of virus-infected cells by cytotoxic T cells.
redback spider killing snake redback spider killing snake
Responses Produced by Activation of Specific Opioid Receptors Responses Produced by Activation of Specific Opioid Receptors
Site-specific recombination, establishing lysogeny in bacteriophage l Site-specific recombination, establishing lysogeny in bacteriophage l
Specific Nutrients and Behaviors Are Important during the First Trimester Specific Nutrients and Behaviors Are Important during the First Trimester
The stress response involves several pathways, which begin with a signaling stimulus The stress response involves several pathways, which begin with a signaling stimulus
Video: Phases of mitosis

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