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 neuron, motoneuron, motor nerve fiber, motor neuron - a neuron conducting impulses outwards from the brain or spinal cord. afferent neuron, sensory neuron - a neuron conducting impulses inwards to the brain or spinal cord. axon, axone - long nerve fiber that conducts away from the cell body of the neuron. dendrite - short fiber that conducts toward the cell body of the neuron.