CVR 27 control of ventilation Flashcards
What does the medullary respiratory centre do?
Recieve information of neural chemical and hormonal which control rate and depth of respiratory movements
What does teh respiratory centre consist of?
Dorsal respiratory an Ventral Respiratory group
Where is the dorsal respiratory group
dorsomedial medulla induces contraction and therefore inspiration and limit expiration
Where is teh ventral respiratory group VRG
Does both. Both sets remain inavtive in quiet brathing.
What is Eupnea
normal breathing
What three parts contribute to the rhythm of breathing?
Pre botzinger
DRG
VRG
How can the rhythm be modified?
Pons
pneumotaxix centre sends signals to DRG which silence inspiratory
Apneustic centre prevents inspiratory neurons from being switched off
What other regions affect breathing?
Cortex - voluntary
Limbic system and hypothalmus - emtional
What muscles are involved in the breathing rhytm?
Diaphragm
Intercostals
Abdominal
Accessory
What are the sensors in breathing
Central chemo
Peripheral chemo
Lung
Other
Where are the peripheral chemoreceptors
carotid and aortic bodies
Whats the pH of CSF
7.32 and has little buffering ability and is controlled by choroid plexus
What happens in peripheral chemoreceptos
responds to arterial changes in P02 and has a fast erepsons
What type of sensory receptors are in the lung?
pulmonary stretch - hering breur reflex
Irritant receptors
Juxta capillary receptors
Bronchial C
When is the reponse to P02 important
high altitudes and chronic lung disease
