The rate of diffusion is directly proportional to temperature; and The rate of diffusion is indirectly related to molecular weight (heavier particles move more slowly than lighter, smaller ones). At room temperature, the average velocity of a molecule is fast-about 2 km/sec (=3997 mph!).
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Efferent nerves of the cranial parasympathetic division transmit signals to the enteric innervation of the gastrointestinal musculature to control digestive processes both in anticipation of food intake and following the meal.