If you stepped in a hole in the yard and sprained your ankle, you have
A. fractured the fibula.
B. torn a ligament of the ankle.
C. fractured the tibia.
D. fractured the calcaneous.
E. torn cartilage on the talus bone.
Answer: B
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The LD50/ED50 is the mathematical expression of what value?
a. the lethal dose b. the effective dose c. the margin of safety d. the mortality dose
The structure in the pharynx which prevents food from entering the larynx is the ___.
a) cricoid cartilage b) thyroid cartilage c) epiglottis d) glottis
What do human cells require to carry out energy-yielding chemical reactions?
a. oxygen b. carbon dioxide c. salt d. ATP molecules e. sunlight
The portion of the nephron that attaches to the collecting system is the
A) proximal convoluted tubule. B) loop of Henle. C) distal convoluted tubule. D) collecting duct. E) minor calyx.