Cardiology - lung function Flashcards
What is the d and what does it do?
D -dorsal respiratory group
inspiratory centre, sets the ‘rate’ for inspiration
what is the V?
expiratory centre
inactive during quiet breathing
inhbits the apenustic centre
What is the A?
A is apneustic centre
stimulated by acitivty in DRG,
inhibitted by pulmonary afferents
What is P?
P is pnemotaxic centre
the ‘inspiratory off switch’
regulates depth and frequency, decided when ‘enough’ of inspiration
Which 2 medualla obloganata inhibte stiumate each other?
How does Pneumotaxic regulate inspiratory?
When AP impluses reaches a thershold activated P centres and cessation of AP
How does Apneustic centre have it affects?
Apneustic helps programme rthym to dorsal centre
What 3 types of nerves innverate the respiratory muscles?
Parasymp
symp
motor
What is function of externalcostal muscles?
internal costal muscles?
external inspiration
internal expiration
What is a singificant feature of capillaries?
Have space between capillaries that are not endo cells -fernatations
How is blood brain barrier different to normal capillaries?
nervous cells that pack endo cells - no leakage
What is the main control of breathing molecules
and why
H+
as it is a product of metabolism
Which only moleucle out of H+, CO2 and HC03- can cross BBB to CSF?
What happens to H+ generated by acidation of C02 in CSF?
Crosses to Medulla and to dorsal respiratory group to determine type of rate and rhythm
Which pulmomary afferents affect ventilation?
irritant receptors
stretch receptors
J-receptors