Quiz 3 Pulmonary & Bronchial Circulations Flashcards
Is the pulmonary blood pressure lower than the systemic system?
The pulmonary resistance is one tenth than that of the systemic system
What is different about the pulmonary artery compared to the aorta?
The pulmonary is 1/3 thickness and is ver0y compliant.
What is the pressure in the right atrium?
3 to 5
What is the pressure in the right ventricle?
25/0
what is the pressure in the pulmonary artery?
25/8
-Mean = 14
What is the pressure in the pulmonary capillaries?
10.5
What is the pressure in the left atrium?
8
What is the pressure in the left ventricle?
120
What is the pressure in the aorta?
- 120/80
- Mean = 90
Will high positive pressure during lung expansion collapse the alveolar vessels?
Yes
What do alveolar vessels closely relate?
Acini
How much of CO goes into the bronchial vessels to feed the respiratory units?
1-2% of the cardiac output from systemic circulation and empty into the left atrium.
How much do the alveolar capillary walls contribute to resistance in the pulmonary system?
40 %
How much do the alveolar arterioles contribute to the resistence in the pulmonary system?
50 %
How much of the alveolar surface area is covered by capillary be?
70 - 80 %
What is the normal capillary volume at rest in the pulmonary system?
70 mL (1 mL/kg)
Does the total capillary volume equal one right ventricular stroke volume?
Yes
How long does it take for gas exchange equilibrium?
0.25 seconds
How much weight is blood in the lung?
40 - 50 %
How much can the pulmonary vasculature alter its volume for capacitance of the left atrium?
Can alter from 50% to 200% of resting volume
What is the length of time the blood remains in the pulmonary vasculature?
0.75 seconds
What is recruitment in the pulmonary system?
Increasing capillary volume by opening closed vessels.
What happens to the pulmonary vascular resistance when increased CO raises pulmonary vascular pressures?
Decreases the pulmonary vascular resistance.
How great does the pleural pressure have to be for inspiration to occur?
Greater than -5cm H2O of pressure
What occurs to the pressure gradient in the ventricle and stoke volume during expiration?
reduction in the pressure gradient allows a greater LV stroke volume.