Select your answer:
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Digestive System › Viewpylorospasm
A. Involuntary contraction of the pyloric sphincter.
B. Narrowing of the pyloric sphincter.
C. No opening of the esophagus (into the stomach).
Pathophysiology › View
The tiny blood vessels that allow substances to move in and out of the blood stream, like oxygen and carbon dioxide, are called:
A. aortas
B. bronchioles
C. veins
D. capillaries