What is secreted by the liver that classifies it as an excretory organ?
A. Erythropoietin
B. Digestive enzymes
C. Urea
D. All apply.
Answer: C
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How many pairs of cranial nerves are there?
a. 8 b. 9 c. 10 d. 11 e. 12
Joe and Jane desperately want to have children, and although they have tried for two years, they have not been successful. Finally, they both agree to consult a specialist, and it turns out that Joe suffers from oligospermia (a low sperm count). He doesn't understand why this would interfere with his ability to have children since he remembers from biology class that "it only takes one sperm to fertilize an egg." What should the specialist tell him?
What will be an ideal response?
Your patient has inflammation of the mucous membrane lining of the stomach. This is known clinically as
A) an ulcer. B) gingivitis. C) cholecystitis. D) ascites. E) gastritis.
All of the following are adaptations that allow the heart to use aerobic respiration for energy except which one?
A. Cardiac cells are rich in myoglobin. B. Cardiac cells are rich in glycogen. C. Cardiac cells use a variety of fuels as energy sources. D. Cardiac cells have fewer mitochondria.