<prompt> Hot water bottle relieves the pain of abdominal spasm byStimulation of adrenergic fibersStimulation of cholinergic fibersInhibition of cold receptorsInhibition of heat receptors  <response>: Pain from gastrointestinal viscera is carried by small C fibers. Temperature sensation from hot water bottles passes through A fibers and large C fibers. When these larger fibers are stimulated, they block the adrenergic small C fibers from the viscera. 