In a classic study, a stomach was transplanted from one rat into another and connected to the circulatory system of the recipient. Food was then injected into the implanted stomach. This experiment indicated that
A) the gastrointestinal tract produces a satiety signal.
B) food-related chemical signals from the stomach are transmitted through the circulatory system to the brain.
C) hunger signals from the stomach are transmitted through the nervous system to the brain.
D) both A and B
E) both A and C
Answer: D
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