Question
A guinea pig is dissected and a portion of its intestine is fixed in the modified Dales chamber to study the effects of some drugs on intestinal contractility. A substance X was infused in the broth following which the graph comes out as depicted. Substance X most closely resembles which of these substances?
| A. |
Epinephrine |
| B. |
Acetylcholine |
| C. |
KC1 |
| D. |
BaCl2 |
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