Quiz 3

Question 1

Increased CO raises what and decreases what

Answer 1

Raises Pulm pressures

Decreases PVR

Question 2

What 2 positions are hydrostatic pressure minimized?

Answer 2

Prone or supine

Question 3

What conditions cause a zone 4 in the lung?

Answer 3

• high pulm pressures (eg LV failure or Mitral stenosis)
• Pulm edema
• increased resistance & low blood flow

Question 4

Different pressures in what 3 things create lung zones?

Answer 4

• Arteries (a)
• Veins (V)
• Alveoli (A)

Question 5

Most active regulation of pulmonary vessels is mediated by what

Answer 5

Local metabolic influences

Question 6

What is a potent vasodilator and a platelet activation inhibitor?

Answer 6

Prostacyclin

Question 7

Causes vasodilation through smooth muscle relaxation through synthesis of cyclic GMP

Answer 7

Nitric Oxide

Question 8

What is a critical factor governing pulmonary circulation?

Answer 8

Partial pressure of O2 in alveoli

Question 9

What is an important mechanism in regulation V/Q ratio?

Answer 9

Hypoxic Pulmonary Vasoconstriction (HPV)

Question 10

What zone does positive pressure ventilation effect?

Answer 10

Zone 2

Question 11

How do you decrease PVR?

Answer 11

• Recruitment (main way)

- Distention