If the tube head is properly sealed, the port is the only place through which x-rays can escape
Indicate whether the statement is true or false
TRUE
Explanation: X-rays produced within the tube are emitted in all directions within the tube housing. A thin window is located in the glass envelope at a point where emission of x-rays is most intense. This is aligned with the port opening in the housing, through which x-rays can escape the tube head.
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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.
Which of the following is a way in which endocrine glands are different from exocrine glands?
A. Endocrine glands secrete hormones. B. Endocrine glands are ductless. C. Endocrine glands stimulate long bone growth. D. all of the above