19.0 Module Overview

Six-scene narrated module trailer with captions, built from BioRender figures: a heart, a kidney in section, molecules and proteins, the liver, a microscope, urine cups, a biopsy needle, Congo-red and apple-green micrographs and an ultrasound monitor; the report, the sticky note and the filter line are drawn.

1. Scene 1 · A little protein (0:00–0:24)

   On screen: A routine urinalysis report: color yellow, clarity clear, protein +, blood negative, glucose negative. The protein row is highlighted in red; the blood and glucose rows in green. Beside it: “her ankles swelled a little by evening — she put it down to standing in front of a class all day”. A sticky note points to the protein row: “a little protein, probably nothing — recheck it”.

   Narration: A routine urinalysis came back with one small plus sign beside the word protein. No blood, no glucose. Her ankles swelled a little bit by evening, which she put down to standing at the front of the classroom all day. The note beside the result said what such notes often say, a little protein, probably nothing, recheck it.

2. Scene 2 · A filter and a regulator (0:24–0:58)

   On screen: Title: “The kidney: a filter and a regulator.” A heart sends an arrow to a kidney: “a fifth of everything the heart pumps”. Lines appear: “it pushes the plasma through a sieve”, “a million times over”, “then hands almost all of it back”, “keeping the salt and water it decides you need”, “and holding on to protein — one protein above all others”.

   Narration: The kidney is a filter, and it's also a regulator. It takes a fifth of everything the heart pumps out, and it pushes the plasma through this like a china cap, if you know what that is, or a sieve. And it pushes it through it a million times over, sieving it and sieving it. And then it hands almost all of it back to the body, keeping the salt and water it decides you need, and holding on to the protein, to one protein above all others.

3. Scene 3 · The dividing line (0:58–1:21)

   On screen: A filter line runs across the picture, blood above and filtrate below. Ions, glucose and a small protein drop through; albumin bounces off; larger proteins stay. Labels: “albumin: the dividing line”, “smaller escapes”, “albumin and anything larger stays in the blood”. Chips: “a plus sign for protein is not a tubule failing to tidy up” and, as one albumin slips through, “it is the filter letting through the one thing it exists to hold”.

   Narration: Albumin, that's the dividing line. Anything smaller than albumin escapes. Albumin and anything larger, that stays in your blood. A plus sign for protein, it's not a tubule failing to tidy up. It's the filter, letting through one thing it exists to kind of hold.

4. Scene 4 · Not a blank slate (1:21–1:43)

   On screen: Left card: “In a healthy person: a trace after a workout or a fever can be nothing.” Right: “Stina was not a blank slate.” “Behind that plus sign: a decade of inflammation no one had named”, with the liver and “SAA”: “years of a protein her liver made without pause”.

   Narration: In a healthy person, a trace after a workout or a fever, that's nothing. But Stina's not a blank slate. Behind that plus sign stood a decade of inflammation no one had named, and years of a protein her liver had been making without ever pausing.

5. Scene 5 · What this module builds (1:43–2:02)

   On screen: A montage of what the module builds: a kidney in section (“the kidney, from the outside in”), a microscope (“under the microscope”), urine cups (“read a urinalysis”), two chart cards (“her chemistries beside another patient’s”), then a needle, a red stain and an apple-green glow (“a needle, a stain, a glow under polarized light”).

   Narration: This module builds the kidney from the outside in, and under the microscope teaches you to read a urinalysis. It sets her chemistries beside another patient's, and it follows that one line to a needle, a stain, and a glow under a polarized light.

6. Scene 6 · Which sentence would you rewrite? (2:02–2:13)

   On screen: An ultrasound monitor: “what a normal-looking kidney can tell you”. The sticky note returns and its line is struck through: “Which sentence in her chart would you rewrite?”

   Narration: By the end, you will know what a normal looking kidney can tell you, and which sentence in her chart you would probably rewrite.