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BIOLOGY · CHAPTER 4
12 / 30What does the loop of Henle do in the nephron?
It builds the medulla's concentration gradient, letting the kidney reabsorb water and concentrate urine.
Spaced repetition
One card's life on the schedule
Grade honestly and the deck does the rest — misses come back sooner, solid cards wait longer. No spreadsheet, no guesswork.
Today
Loop of Henle?
You flip the card and grade it Good.
+2 days
Loop of Henle?
It comes back just before you'd forget.
+1 week
Loop of Henle?
Still solid — the interval stretches.
+1 month
Loop of Henle?
Now it lives in long-term memory.
“Rereading wins the sprint; retrieval wins the exam.”
recalled after a week vs. rereading
students learn more with spacing
Why it works
Flashcards force retrieval — pulling an answer out of memory instead of recognizing it on a page. In Roediger and Karpicke's 2006 experiments, students who practiced recall remembered roughly 50% more after a week than students who reread. And in Kornell's 2009 flashcard study, one large spaced deck beat crammed stacks for about 90% of students — most of whom believed cramming had worked better.
That gap between what works and what feels like it works is exactly why PocketNote runs the schedule for you. Your only job is honest grading; the deck follows the evidence, even when instinct argues.
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