Week 10: Respiratory Resistance

Question 1

What is the relationship betweeb length of airway and resistance?

Answer 1

larger airways have larger resistance

Question 2

Draw the graph that displays the resistance v.s. airway generation

Answer 2

airway generations ↑

↓

air way becomes smaller

↓

resistance ↓

Question 3

How does smooth muscle regulate bronchial tone?

Answer 3

contraction

resistance can be changed

Question 4

Name the branchodilators.

Answer 4

beta 2 receptors → cAMP↑

NO → cGMP↑

VIP → cAMP↑

Question 5

Name branchoconstrictiors and what do they do?

Answer 5

↑ resistance

• Ach → M₁ → Ca²⁺⁺ ↑
• Histamine → H₁ → Ca²⁺⁺ ↑
• dust, smoke, cold air

Question 6

Dispaying the graph of PCO₂ as a functoin of alveolar ventilation in the lung.

Answer 6

Question 7

What is the VCO₂ with mild exercise?

Answer 7

750 ml/min

Question 8

What is the VCO₂ during rest?

Answer 8

250 ml/min

Question 9

When PCO_{<strong>2</strong>} is > 40 mmHg what is the condition?

Answer 9

hypoventilation

Question 10

When PCO₂ < 40 mmHg what is the condition?

Answer 10

hyperventilation

Question 11

What is the equation for total volume ?

Answer 11

V_T = V_D+ V_{<span>A</span>}

Question 12

Why is pleural pressure always negative?

Answer 12

to keep airways open

Question 13

During exhalation and inhalation what is P_alv ?

Answer 13

exhalation: positive (+)

inhalation: zero

Question 14

What is the graph displaying air way resistance and conductance

Answer 14

↓ size of lung

↓

↓size of airways

↓

↑ resistance

Question 15

Describe the relation between inspired air/gas density and resistance

Answer 15

n in haigen poiseuille law = denisty of gas

↓density = ↓n =↓resistance

He has small density

Question 16

What is the relationship between turbulent flow and resistance.

Answer 16

HP law is only for laminar flow

Tuurbulance always ↑ resistance

Question 17

What is EPP?

Answer 17

equal pressure point