Week 10: Respiratory Resistance Flashcards
What is the relationship betweeb length of airway and resistance?
larger airways have larger resistance
Draw the graph that displays the resistance v.s. airway generation
airway generations ↑
↓
air way becomes smaller
↓
resistance ↓
How does smooth muscle regulate bronchial tone?
contraction
resistance can be changed
Name the branchodilators.
beta 2 receptors → cAMP↑
NO → cGMP↑
VIP → cAMP↑
Name branchoconstrictiors and what do they do?
↑ resistance
- Ach → M1 → Ca2++ ↑
- Histamine → H1 → Ca2++ ↑
- dust, smoke, cold air
Dispaying the graph of PCO2 as a functoin of alveolar ventilation in the lung.
What is the VCO2 with mild exercise?
750 ml/min
What is the VCO2 during rest?
250 ml/min
When PCO<strong>2</strong> is > 40 mmHg what is the condition?
hypoventilation
When PCO2 < 40 mmHg what is the condition?
hyperventilation
What is the equation for total volume ?
VT = VD+ V<span>A</span>
Why is pleural pressure always negative?
to keep airways open
During exhalation and inhalation what is Palv ?
exhalation: positive (+)
inhalation: zero
What is the graph displaying air way resistance and conductance
↓ size of lung
↓
↓size of airways
↓
↑ resistance
Describe the relation between inspired air/gas density and resistance
n in haigen poiseuille law = denisty of gas
↓density = ↓n =↓resistance
He has small density
