Pulmonary Circulation Flashcards
The lung has how many circulations? what are they
two circulations
- High pressure; low flow circulation
- low pressure; high flow circulation
The high-pressure, low-flow circulation supplies systemic arterial blood to the
- From thoracic aorta into the bronchial arteries which supply:
- trachea
- bronchial tree (including the terminal bronchioles)
- supporting tissues of the lung (CT)
- outer coats (adventitia) of the pulmonary arteries and veins
The low-pressure, high-flow circulation supplies
- Pulmonary artery and branches to alveoli
- venous blood from all parts of the body to the alveolar capillaries where O2 is added and carbon dioxide is removed.
The pulmonary artery has a wall thickness _____ that of the aorta
1/3
All the pulmonary arterial branches have _____ diameters than their counterpart systemic arteries
larger
The larger diameter and the fact that the vessels are thin and distensible, give the pulmonary arterial tree a _______, averaging almost ______ ml/mm Hg, which is similar to that of the entire systemic arerial tree
Large compliance, 7 mL/mm Hg
What allows the pulmonary arteries to accommodate the stroke volume output of the right ventricle
Large complaince
Pressure in right ventricle during systole
25mm Hg
Pressure in right ventricle during diastole
0-1 mm Hg
Left ventricle systolic pressure
120-125 mm Hg
left ventricle diastolic pressure
0-5 mm Hg
Pulmonary artery systolic pressure
24-25 mmHg
Pulmonary artery diastolic pressure
8-9 mmHg
Mean pulmonary arterial pressure
15 mmHg
mean pulmonary capillary pressure
7 mmHg
during ______, the pressure in the pulmonary artery is essentially equal to the pressure in the right ventricle.
systole (note that it is about 25 mm Hg)
The pulmonary arterial pressure =
24/9 mm Hg
mean pulmonary arterial pressure=
15 mmHg
Left atrium pressure during diastole =
8 mmHg
What is the pressure gradient in pulmonary system
7 mmHg
Mean pressure in the left atrium and pulmonary veins is about
2 mmHg
how is mean pressure of the left atrium measured
using a pulmonary wedge
What volume of blood is within the pulmonary circulation
450mL
What % of total blood volume is in the pulmonary system
9%