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)
If you like what you here, you can purchase the entire Gold Standard Step 1 MP3 audio USMLE review for your iPhone, iPod, or computer here.
Let’s start our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.
Play USMLE Audio MP3 58 21 Loop of Henle Reabsorption Below
Begin 58 21 Loop of Henle Reabsorption Transcription
What does the thin descending limb of the Loop of Henle reabsorb?
And how does it do this?
- The thin descending limb reabsorbs water by passive reabsorption.
And what is this due to? The answer starts with MH.
- Medullar hypertonicity.
What two substances are primarily responsible for the hypertonicity for the renal medulla?
- Sodium chloride and urea.
List three substances actively reabsorbed by the thick ascending limb of the Loop of Henle. I’ll cue you with the first letter of each.
What percent of sodium reabsorption does this account for?
And there is induced reabsorption of what two substances in the thick ascending limb? They start with C and M.
- Calcium and magnesium.
Student doctor, please pause the tape and summarize what we’ve discussed about tubular transport in the thin descending limb of the Loop of Henle and the thick ascending limb of Henle.
- The thin descending limb passively reabsorbs water. This happens because of the hypertonicity of the medulla which is primarily due to sodium chloride and urea. The three substances actively reabsorbed by the thick ascending limb of the Loop of Henle are chloride, potassium, and sodium. This accounts for 20% of the sodium reabsorption. There is also induced reabsorption of calcium and magnesium in the thick ascending limb.
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