After the release of chest pressure during phase 4 of the Valsalva maneuver, was
ID: 170887 • Letter: A
Question
After the release of chest pressure during phase 4 of the Valsalva maneuver, was the glossopharyngeal nerve (cranial nerve IX) increasing or decreasing frequency of action potentials into the brainstem?
After the release of chest pressure during phase 4 of the Valsalva maneuver, was sympathetic innervation to the heart increasing or decreasing?
After the release of chest pressure during phase 4 of the Valsalva maneuver, was parasympathetic innervation to the heart via cranial nerve X (vagus) increasing or decreasing?
Explanation / Answer
After the release of chest pressure during phase 4 of the Valsalva maneuver, the frequency of action potentials of glossopharyngeal nerve (cranial nerve IX) into the brainstem is decreased.
After the release of chest pressure during phase 4 of the Valsalva maneuver, sympathetic innervation to the heart is increased.
After the release of chest pressure during phase 4 of the Valsalva maneuver, parasympathetic innervation to the heart via cranial nerve X (vagus) is also increased.