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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

Elephant work camp in Thailand. Elephants are used for heavy forest work and in circus presentations Elephant work camp in Thailand. Elephants are used for heavy forest work and in circus presentations
Decapods, from Ernst Haeckel's 1904 work Kunstformen der Natur Decapods, from Ernst Haeckel's 1904 work Kunstformen der Natur
Medical assistants can quickly pull up a patient record when a phone call is received. Medical assistants can quickly pull up a patient record when a phone call is received.
It is important for new employees to know the location of all fire extinguishers. (A) Pull the pin ... It is important for new employees to know the location of all fire extinguishers. (A) Pull the pin ...
Work and Gender: Women at Work in India Work and Gender: Women at Work in India
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Video: Predator- prey competition and symbiosis

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