Topics:
Animal Physiology, Animal Refresher
Center Regulating Cessation of Inspiration
Which center regulates point of cessation of inspiration?
- Pneumotaxic center of Pons — Correct Answer
- Dorsal respiratory center
- Ventral Respiratory center
- Lateral respiratory center
Explanation:
Correct Answer: Pneumotaxic center of Pons
The Pneumotaxic center (located in the upper pons — parabrachial nuclei) regulates the point of cessation (cut-off) of inspiration, preventing over-inflation of the lungs.
Respiratory Centers
- Dorsal Respiratory Group (DRG) — Medulla: Primary rhythm generator for inspiration; drives the diaphragm and external intercostals during normal quiet breathing.
- Ventral Respiratory Group (VRG) — Medulla: Active during forced/active expiration; controls accessory muscles of breathing (internal intercostals, abdominal muscles). Inactive during normal quiet breathing (expiration is normally passive).
- Pneumotaxic Center — Upper Pons: Inhibits/switches off DRG inspiration → limits tidal volume → determines respiratory rate. Lesion → prolonged inspiration (apneustic breathing).
- Apneustic Center — Lower Pons: Promotes inspiration (opposes pneumotaxic center) → deep, prolonged inspiration. Normally overridden by pneumotaxic center.
Respiration Types
- Costo-abdominal: Horse, Mule, Donkey (normal)
- Costal: Cat, Dog
- Abdominal: Ruminants (normal)
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
