Bio February 25

Bio February 25 - Bio February 25 *Nothing before Lecture...

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Bio February 25 *Nothing before Lecture 11 on Exam 2! Friday Lecture – Lecture 17 Chart on Loop of Henle 1. Pull nutrients, glucose, potassium, and dump ammonia 2. Remove water (selectively permeable) 3. Pull salt out (permeable to salt only) to concentrate interstitial fluid 4. Balancing of salts 5. Pull out water – concentrate urine a lot Numbers in chart are telling concentration of fluid Why do we even need ascending loop of Henle? - You can’t cut it at bottom, because this fluid can’t become as concentrated as it is; once there’s lots salt you need H2O to pull it out; ascending loop is creating salty interstitial fluid and is essential for nephron!! Surrounding fluid is now more salty (hypertonic) - The ascending loop of Henle helps to make the interstitial fluid hypertonic relative to the filtrate Question: In what part of the nephron is most of the sodium chloride removed from the filtrate (ie. Where is the tubule membrane selectively permeable to salt but not water)? -
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Bio February 25 - Bio February 25 *Nothing before Lecture...

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