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Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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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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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Wasp ocelli (simple eyes) and dorsal part of the compound eyes; also showing fine, unbranched hairs Wasp ocelli (simple eyes) and dorsal part of the compound eyes; also showing fine, unbranched hairs
Lungs: RUL = Right Upper Lobe, RML = Right Middle Lobe, RLL = Right Lower Lobe, LUL = Left Upper Lob Lungs: RUL = Right Upper Lobe, RML = Right Middle Lobe, RLL = Right Lower Lobe, LUL = Left Upper Lob
The bones of the skeleton. The skeleton, anterior view. The bones of the skeleton. The skeleton, anterior view.
Anterior and posterior body regions. Anterior and posterior body regions.
Cross-section of the anterior view of the female pelvis Cross-section of the anterior view of the female pelvis
Anterior view of shoulder blade Anterior view of shoulder blade
Video: Introduction to Sickle Cell Anemia

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