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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.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

Muscle Strength of the Fingers Muscle Strength of the Fingers
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The three types of muscle: Skeletal, cardiac, and smooth. The three types of muscle: Skeletal, cardiac, and smooth.
The patellar reflex. (A) Striking the patellar ligament excites the quadriceps muscle spindles.(B) ... The patellar reflex. (A) Striking the patellar ligament excites the quadriceps muscle spindles.(B) ...
Muscle weakness caused by myasthenia gravis is evident in the eyes of this patient. Muscle weakness caused by myasthenia gravis is evident in the eyes of this patient.
Direct pressure to suboccipital muscles. Fingers press up into the cervical muscle attachments along ... Direct pressure to suboccipital muscles. Fingers press up into the cervical muscle attachments along ...
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