Resp 3 Flashcards
MET meaning
Metabolic equivalent of Task
1 MET =
3.5 mL/kg/min
240ml/min
At max exercise
Tidal Volume =
0.5 x Vital Capacity
Owles Point
Critical point of oxygen consumption where ventilation increases more in proportion to oxygen consumption
During ascending, inspired PIO2 is what compared to atmosphere?
less
3x acute responses from altitude
Hyperventilation
Alkalosis
Diuresis
What happens to 2,3 DPG during acclimatisation
Reduces
what mixture of gas is used in diving
Helium / Oxygen
Minute Ventilation equation
Breathing Frequency x Tidal Volume
What does the respiratory centre consist of (2)
What controls what?
Medulla + Pons
Pons regulates the Medulla
Positive Stimulation of the medulla (2)
Peripheral Chemoreceptors
Central Chemoreceptors
Peripheral Chemoreceptors stimulated by (3)
O2 decreasing
CO2 rising
H+ rising
Central Chemoreceptors stimulated by (2)
CO2 increasing
H+ rising
Baroreceptors does what to ventilation
Increases BP = decrease Ventilation
J receptors are activated when?
What does it do to ventilation?
Activated in Traumas
Increases
What leads to negative stimulation of the medulla/pons? (2)
Stretch receptors in lungs
irritant receptors in lungs
Negative stimulation is regulated by what nerve
Vagus nerve
Carotid / Aortic Bodies are sensitive to what (3)
Low O2
High CO2
High H+
Definition of Oxygen Delivery
O2 leaving heart in 1 min
Definition of Oxygen Consumption
O2 used by body in 1 min
Equation of Oxygen Delivery
O2 in blood x Cardiac Output
Factors affecting oxygen consumption (3)
Age
temperature
Exercise
Respiratory Exchange ratio
Ratio of CO2 production to O2 consumption
Affected by respiratory exchange ratio (2)
Hyperventilation
Metabolic Fuel
