Acid reflux into the esophagus ("heartburn") is normally prevented by ________.
A. pharyngeal and buccal sphincters
B. the lower esophageal sphincter (LES)
C. pharyngeal constrictors
D. esophageal glands
E. the upper esophageal sphincter
Answer: B
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The hilum of the spleen is part of its
A. convex posterolateral border. B. convex anteromedial border. C. concave anteromedial border. D. concave posterolateral border.
The thymus gland secretes erythropoietin in response to low blood oxygen.
Answer the following statement true (T) or false (F)
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a) gouty arthritis b) Lyme disease c) bursitis d) osteoarthritis e) synovitis