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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Brachial plexus injury in newborns. The brachial plexus is a group of nerves around shoulder. A loss of movement or weakness of the arm may occur if these nerves are damaged. This injury is called neonatal brachial plexus palsy (NBPP) The nerves of the brachial plexus can be affected during a difficult delivery. Injury may be caused by: 1  The infant's head and neck pulling toward the side as the shoulders pass through the birth canal.  Stretching of the infant's shoulders during a head-first delivery.