USMLE Step 1 Respiratory Physiology Review 61 09 Pulmonary Blood Flow

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Play USMLE Audio MP3    61 09 Pulmonary Blood Flow  Below

Begin   61 09 Pulmonary Blood Flow  Transcription

Moving now to pulmonary blood flow.

What kind of blood is carried by the pulmonary arteries?

• The pulmonary arteries carry oxygen deficient blood from the heart to the lungs

What is the rule for arteries?

• Arteries always carry blood away from the heart

What structure carries oxygen rich blood from the lungs to the heart?

• Pulmonary veins

In order for good oxygen uptake in the lungs to occur, what is the relationship of pulmonary blood pressure to systemic blood pressure?

• Pulmonary blood pressure is much lower than systemic blood pressure

What is the normal systolic pressure in pulmonary artery?

• About 20 mm Hg

What is the normal diastolic pressure in the pulmonary artery?

• About 10 mm Hg

How does blood flow resistance in the pulmonary circulation compare to blood flow resistance in the systemic circulation?

• Pulmonary blood flow resistance is about one tenth of systemic flow resistance.

When exercise or other causes create an increase in carbon dioxide in the blood, what process happens in the lungs to lower pulmonary flow resistance?

• The apical capillaries that are normally closed will open in response to vasodilation.

Student doctor, please pause the tape and summarize what we’ve discussed about pulmonary blood flow.

• The pulmonary arteries carry oxygen deficient blood from the heart to the lungs. Arteries always carry blood away from the heart. Pulmonary veins carry oxygen rich blood from the lungs to the heart. Pulmonary blood pressure is much lower than systemic blood pressure which allows good oxygen uptake in the lungs to occur. Normal systolic pressure in the pulmonary artery is about 20 mm Hg and normal diastolic pressure in the pulmonary artery is about 10 mm Hg. Pulmonary blood flow resistance is about one tenth of systemic flow resistance. When exercise or other causes create an increase in carbon dioxide in the blood, the apical capillaries that are normally closed will open in response to vasodilation and pulmonary flow resistance is lowered.

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