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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The efferent nerve fiber is the axon of a motor neuron. Bundles of these axons form a motor nerve, or efferent nerve. In the nervous system there is a closed loop system of sensation, decision, and reactions. This process is carried out through the activity of sensory neurons, interneurons, and motor neurons.