The most abundant and active form of estrogen is:
A) Estrone.
B) Estradiol.
C) Estriol.
D) Progesterone.
B
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An absolute refractory period occurs when a nerve fiber can be restimulated only by a much stronger stimulus than the initial stimulus
A) True B) False
A modern DXA scanning system consists of
1. workstation 2. x-ray tube 3. Bucky assembly 4. x-ray detector 5. tilting, radiolucent table 6. QC phantom 7. AEC system with three fields 8. positioning aides a. 1, 2, 5, 6, 7, and 8 b. 1, 2, 3, 4, and 5 c. 1, 2, 4, 6, and 8 d. 1, 2, 3, 4, 5, and 7