On these “Gold Standard Step 1 Facts” pages you will find Free:
- USMLE Audio Review files from our “Gold Standard USMLE Reviews”
- Transcriptions of those files
- And videos (as they become available)
The idea is that you can review for the USMLE online by:
- Listening to the Audio
- Following along with the transcription
- Or by watching the video (if available)
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Let’s start our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.
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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