In gastrointestinal tract, serotonin causes (a) Contraction of gastrointestinal muscles (b) Decreased muscle tone (c) Decreased peristalsis (d) All of the above

In gastrointestinal tract, serotonin causes (a) Contraction of gastrointestinal muscles (b) Decreased muscle tone (c) Decreased peristalsis (d) All of the above
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