Neural control of breathing Flashcards
1
Q
Which centres control breathing?
A
- Respiratory pattern generator is present in medulla
- Locomotor pattern generator in spinal cord
- Produce rhythmic, frequent, repetitive movements
2
Q
Which factors influence the respiratory pattern generator?
A
- pO2
- pCO2
- pH
- Lung strength (prevents hyperinflation of lungs)
3
Q
What is the firing rate of the respiratory pattern generator?
A
- 12-15 times per minute
- Sends motor output to respiratory muscles
4
Q
Where does the motor output go to from the R.P.G?
A
- Muscles of respiration
- Contract and relax 12-15 times per minute
5
Q
What centres in the medulla are involved in controlling respiration?
A
- Inspiratory centre
- Expiratory centre
- They inhibit each other
- Can’t breathe in and out at the same time
- Always net movement of air
6
Q
Where is the inspiratory centre synapsed?
A
- On neurones supplying diaphragm
- Via phrenic nerve
- Also synapses on neurones supplying external intercostals
- Via intercostal nerves
7
Q
Where is the expiratory centre synapsed?
A
- On neurones supplying internal intercostals and innermost intercostals
- Via intercostal nerves
8
Q
What stimulates the inspiratory and expiratory centres?
A
- Respiratory pattern generator
- Mostly relatively silent (tidal ventilation)
