Quiz 25: Control of Respiration

The respiratory control center is located in: A)The cerebral cortex. B)The pons. C)The medulla oblongata. D)The cerebellum.

Carotid sinus nerve activity is increased in the presence of: A)High O₂ levels in the blood. B)Normal CO₂ levels in the blood. C)Low O₂ content. D)Low pH.

Increased activity in the neurons in the dorsal respiratory group is associated with: A)High lung volume. B)High levels of CO₂ in the blood. C)High levels of O₂ in the blood. D)Breath holding.

Changes in partial pressure of oxygen (Po₂)are recognized/sensed by: A)Central chemoreceptors. B)Peripheral chemoreceptors. C)Pulmonary mechanoreceptors. D)The blood-brain barrier.

The Hering-Breuer reflex is: A)An inspiratory inhibitory reflex. B)Stimulated by lung deflation. C)Mediated by the phrenic nerve. D)Activated by low Po₂.

Mild-moderate exercise is associated with: A)Increases in arterial partial pressure of carbon dioxide (Pco₂). B)Decreases in arterial Po₂. C)Normal pH. D)Lactic acidosis. E)Anaerobic metabolism.

Irritant receptors in the lower airway respond to all of the following except: A)Chemical vapors. B)Physical factors. C)Distortion of the alveolar walls. D)Particles.

Central apnea is characterized by: A)Vigorous chest wall and abdominal muscle activity. B)Cessation of airflow at the nose. C)Snoring. D)Severe hypercarbia.

The ventilatory response to CO₂ is enhanced by: A)Hypoxia. B)Alkalosis. C)Sleep. D)Barbiturates.

The respiratory "pacemaker" is located in: A)The dorsal respiratory group. B)The ventral respiratory group. C)The cerebral cortex. D)Chest wall joints and muscles.