Bone consists of ________ for its tensile strength.
A) hydroxyapatite
B) collagen
C) osteohydrate
D) calcium
B) collagen
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The age at which infants first exhibit the classic sleep stages seen in adults is ____ months
a. 6 c. 12 b. 9 d. 18
A pulse oximeter differentiates oxyhemoglobin from deoxygenated hemoglobin by which of the following methods?
a. Relating cyclical changes in light transmis-sion through the sampling site. b. Shining and comparing two wavelengths of light through the sampling site. c. Direct measurement by a heated polaro-graphic electrode applied to the skin. d. Using a color sensing device that absorbs one wavelength of light through the skin.
On the right side of the heart, ____, or right heart failure, results from increased pressures in pulmonary circulation that can arise from any of a number of causes.
A. cor pulmonale B. atelectasis C. ischemia D. septicemia
The most popular type of contraceptives in the United States are:
A. the oral contraceptive B. intrauterine devices (IUDs) C. condoms D. coitus interruptus