What is the most common cause of elevated levels of antidiuretic hormone (ADH) secretion?
a. Autoimmune disease
b. Cancer
c. Pregnancy
d. Heart failure
ANS: B
The most common cause of elevated levels of ADH is cancer, not autoimmune disorders, preg-nancy, or heart failure.
Health Professions
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Which of the following structures of the tooth appears the most radiopaque?
a. Cementum b. Enamel c. Dentin d. Pulp
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What is the term for the ability of cardiac muscle fibers to shorten in response to an electrical stimulus?
A. conductivity B. contractility C. automaticity D. excitability
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