Respiratory system 11

The pacemaker of respiration is

• Pre-Botzinger complex
• DRG
• VRG
• Apneustic centre

If the apneustic centre is destroyed along with vagotomy, the following pattern would be observed

• Prolonged inspiration
• Prolonged expiration
• slow and shallow respiration
• Animal dies due to absence of respiration

The switch over from inspiration to expiration is controlled by

• apneustic centre
• pneumotaxic centre
• DRG
• VRG

Midpontine transection will lead to

• hyperventilation
• apneusis
• rapid and shallow breathing
• hypoxia

Transection between pons and medulla would lead to ---- in respiration

• apnea
• irregular and gasping
• slow and deep respiration
• no effect

Hypercapnia acts at

• DRG
• VRG
• Medulla
• apneustic centre

Central chemoreceptors are most sensitive to

• Hypercapnia
• hypoxia
• hypocapnia
• Acidosis

Most important stimulus for peripheral chemoreceptors is

• Hypoxia
• Hypercapnia
• Hypocapnia
• Acidosis

Anemia doesnot stimulate chemoreceptors as

• PO2 is not affected
• PCO2 is not affected
• pH is not affected
• Cannot be answered

Glomus type 1 cells sense hypoxia by

• inhibition of Mg channels
• Inhibition of Ca channels
• Inhibition of Na channels
• Inhibition of K channels