Generation of the Respiratory Rhythm (PK8) Flashcards
1
Q
Control of quiet breathing by respiratory neurone groups
A
- DRG drives inspiration by activating phrenic nerve –> diaphragm
- Diaphragm relaxes for expiration
2
Q
Where is sensory information to induce increased breathing sent to?
A
NTS
3
Q
How does the NTS cause increased inspiration
A
- Drives neurones of DRG + VRG (insp.)
- Activates diaphragm + inspiratory accessories respectively
4
Q
How does the NTS cause increased expiration?
A
- Activates Botzinger complex
- Inhibits DRG + VRG (insp.)
- Excites VRG (exp.) –> expiratory accessories
5
Q
How is simultaneous inspiration and expiration prevented?
A
DRG + VRG (exp.) send each other inhibitory signals
6
Q
How does the NTS influence timings of breathing?
A
- Sends signals to PRG
- This sends excitatory + inhibitory signals to DRG
7
Q
What information comes from the higher centres, and what does this do?
A
- Temperature, pain, emotion, limb proprioceptors
- Sends excitatory/inhibitory signals to DRG
8
Q
How do signals from cerebral cortex (voluntary breathing) relate to this system?
A
They bypass it entirely and control muscles directly
