Human Phys 6.10 Flashcards
(26 cards)
What do low intensity exercise or short duration high intensity exercise not do in healthy individuals?
Elicit diaphragm fatigue
When does diaphragm fatigue occur?
At sustained lower intensity exercise when work of breathing is increased (hypoxic environments or COPD)
What does hypoxemia exacerbate?
Rate of peripheral muscle fatigue
What does reducing work of breathing by 50-70% during high intensity exercise show?
Prevent diaphragm fatigue
Reducing peripheral muscle fatigue by 25-30%
Prolonging exercise duration by 10-20%
What parts of the airways participate in gas exchange?
Alveolar sacs and ducts
Where are cilia not found?
Alveolar sacs
What type of cells secrete mucus?
Goblet cells
What do type 2 pneumocytes secrete?
Surfactant
How do alveolar ducts and sacs maintain their hygiene if they don’t have cilia?
Macrophages alveolar
What is our resting membrane volume called?
Tidal volume
What is the dead space in the lungs?
Anatomical and physiological spaces
Which dead space is at the alveolar sac where there is no perfusion?
Physiologic
How is restrictive lung disease shown on the FEV1/FVC chart?
Decreased total volume
How is the obstructive lung disease shown on the FEV1/FVC chart?
Severe decrease in FEV1
Which type of gas does not exert partial pressure?
Bound gas
Is the transport of O2 diffusion or perfusion limited?
Perfusion
What section of the capillary is the blood fully saturated?
1/3
What % of diffused O2 dissolved?
2%
Why is SPO2 below 90% a concern?
PO2 is below 60 mmHg
What does not cause a right shift of hemoglobin dissociation curve?
Increase in pH
What transports CO2 in blood when it is bound?
Hemoglobin
What’s the difference between blood flow and CO?
No difference
Pulmonary blood for autoregulation handles vasodilation and vasoconstriction. Which is the correct answer?
Decrease O2= vasoconstriction
Increase O2= vasodilation
If you are standing which region has the highest pulmonary blood flow?
Lower lobe
