On this Page: 1  The significance of Mercury Retrograde. 2  Indicators in the charts of people especially sensitive to the Mercury Retrograde cycle. 3  How this Mercury Retrograde cycle affects each sign of the zodiac.
The H-reflex (or Hoffmann's reflex) is a reflectory reaction of muscles after electrical stimulation of sensory fibers (Ia afferents stemming from muscle spindles) in their innervating nerves (for example, those located behind the knee).fter about 5 days in zero gravity, for instance in orbit around Earth, the h-reflex diminishes significantly. It is generally assumed that this is due to a marked reduction in the excitability of the spinal cord in zero gravity.
The efferent arm of the cough reflex is a coordinated contraction of the respiratory musculature against a closed glottis. The glottis then opens and the expelled air approaches the speed of sound shearing off any mucus within the airways. This gives rise to the characteristic low frequency component of a wet cough.he efferent arm of the cough reflex is a coordinated contraction of the respiratory musculature against a closed glottis. The glottis then opens and the expelled air approaches the speed of sound shearing off any mucus within the airways. This gives rise to the characteristic low frequency component of a wet cough.