There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
Man undergoing a stress test on a treadmill while physician monitors his condition
Stress
Positive and Negative Symptoms of Schizophrenia
Generally, the total tax burden in the United States is much lower than that of other industrialize
Physiological Stress Response (cont.)
Cell-mediated immunity, primary and secondary response.