Pulmonary Blood Flow

Question 1

What conditions increase pulmonary blood pressure?

Answer 1

CHF, emphysema, etc.

Question 2

What’s the pO2 of pulmonary blood?

Answer 2

40 mmHg

Question 3

What the pCO2 of pulmonary blood

Answer 3

45-46 mmHg

Question 4

What conditions change alveolar pressure?

Answer 4

tension pneumothorax, positive pressure ventilation

these increase pressure which occludes blood vessels

Question 5

How does acetylcholine relax muscle?

Answer 5

watch lecture recording

Question 6

Why is blood pressure less in the pulmonary system?

Answer 6

shorter length and larger radius of the vessels. This is to keep the lungs dry.

Question 7

What is pulmonary resistance?

Answer 7

2 mmHg/L/min

Question 8

What is pulmonary flow and how do you calculate it?

Answer 8

If Oxygen volume consumed is 250 ml/min and oxygen concentration in blood is 20 ml/dL and 15 ml/dL in arteries and veins, what is pulmonary flow? 50 dL or 5L

Question 9

What portion of the lung receives less blood flow?

Answer 9

The apex of the lung

Question 10

In what condition is pulmonary hydrostatic pressure increased?

Answer 10

CHF, kidney failure with hypoalbuminemia

Question 11

What do prostalandins do in babies?

Answer 11

Keep ductus arteriosus open

Question 12

Zone 1 of lung

Answer 12

PA > Part > Pvenous (physiologic dead space)

Question 13

Zone 2 of lung

Answer 13

Part > PA > Pvenous

Question 14

Zone 3 of lung

Answer 14

Part > Pvenous > PA