Electrophysiological Recordings Are Made to Determine the Activity of Respiratory

question 125

Multiple Choice

Electrophysiological recordings are made to determine the activity of respiratory motor neurons from a patient's medulla.The recordings show that the respiratory motor neurons from the dorsal medulla are functioning normally, but those from the ventral medulla have lower than normal activity.Which is the patient's most likely symptom?

• A) His diaphragm functions normally during breathing, but he is unable to breathe deeply enough for intense physical exercise.
• B) His breathing is compromised when at rest and he needs to be on a respirator because his diaphragm does not contract.
• C) His lungs are unable to expand into an expanding thoracic cavity during breathing.
• D) His lungs are unable to contract adequately after they have filled with air.
• E) He is able to inhale deeply but is unable to exhale deeply.

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