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MODULE 2: Just Enough Chemistry
PART 4 OF 7
After every attack she describes the same bone-deep exhaustion: “like I ran a marathon lying in bed.” Inflammation, it turns out, is metabolically expensive — her body really had been working that hard.
Slide 1 Transcript
PATIENT CHART
STINA
Grad student · recurrent fevers, pain & swelling since childhood
THIS PART
Age 28
PRESENTING WITH
Elevated Actue-Phase Proteins
ACTION TAKEN
Monitoring
TESTS ORDERED
CRP, SAA, C3 & C4
CHART CLUES
COLLECTED AS YOU GO
Elevated Actue-Phase Proteins
A Fragile-by-Design Protein
Blood Chemistry “A Little Off”
The Metabolic Cost of Inflammation
?
?
?
Put your money down: Can lying still cost a marathon’s worth of fuel?
She barely moved, yet felt wrung out for days. Commit now: is inflammation actually that expensive, or was it in her headRounded proximal end that fits into the acetabulum of the hip bone.?
Pick the answer you believe now. We’ll come back to it later!
“Like I ran a marathon lying in bed”
Every fever Stina runs burns fuel, because inflammation is metabolically expensive — and she has the receipts in her own words. After every attack, the same description: a bone-deep exhaustion, “like I ran a marathon lying in bed.” For years that fatigue was treated as further evidence that the problem was in her head, a vague tiredness with no respectable cause. It was nothing of the kind. Mounting an inflammatory response and holding a raised body temperature both cost real, measurable energyThe capacity to do work or cause change., and her body had been quietly footing the bill for decades.
Potential vs Kinetic
Energy stored versus energy in motion — and bonds are where the body banks it.
Slide 2 Transcript
Cash out the clip
Single Choice: Two calls on the two faces of energy.
Endergonic
Some reactions pay out, some need a push over the hump — the rock pile before it rolls.
Slide 3 Transcript
Exergonic
Some reactions pay out, some need a push over the hump — the rock pile before it rolls.
Slide 3 Transcript
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Drag the Words: Drag each reaction type to what it does with energy.
Two facts land on her case
Energy comes in kinetic and potential forms, always flows downhill as thermodynamics demands, and is pried out of food and banked in ATPThe energy currency of cells used for muscle contraction. — the cell’s small, rechargeable currency, cycling to ADPA molecule produced when ATP releases energy. and back to power its pumps and its building. None of it would happen fast enough to matter without enzymesProteins that speed up chemical reactions in the body.: biological catalysts that lower a reaction’s activation energyThe minimum amount of energy required to start a chemical reaction., each one shaped to grip its specific substrate like a lock fitted to a key. Speed up the chemistry and life becomes possible; slow it down and the same reactions would take years.
ATP: The Rechargeable Battery
Charge it, spend it, charge it again — the body’s currency never sits still.
Slide 4 Transcript
Spending ATP
Every heartbeat and nerve impulse is an ATP transaction — even while you lie still.
Slide 5 Transcript
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Fill in the Blanks: Fill in how the battery cycles.
The molecules themselves walk on
Two facts here land squarely on Stina’s case. First, heat denatures proteinsLarge molecules made of amino acids with various functions in the body., so a high fever can physically disable the very enzymes the body runs on — part of why a fever that climbs too far is genuinely dangerous, not merely uncomfortable. Second, because enzymes are so precise, they make excellent drug targets: block one specific enzyme and you can switch off one specific process. That is a quiet preview of how a drug that blocks the enzyme building prostaglandins can bring a fever down — and of why her eventual treatment will be a matter of jamming one machine, not sedating a whole body.
Enzymes Lower the Hump
Dry frogs won’t jump the wall alone — an enzyme lowers it so the reaction goes.
Slide 6 Transcript
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Multiple Choice: One question on what a catalyst really does.
Built for one Job
Enzymes are not multitaskers. They do one job and one job only.
Slide 6 Transcript
Lock and Key
Each enzyme fits one substrate — shape is the whole secret, again.
Slide 6 Transcript
Cash out the clip
Flip Cards: Flip through the active-site basics.
FINDING!
The Metabolic Cost of Inflammation
The bone-deep fatigue after every attack — long dismissed as ‘in her head’ — reframed with new evidence: mounting inflammation and holding a fever both cost real, measurable ATP. A high fever can even denatureThe process in which a protein loses its shape and function due to heat or pH changes. the enzymes the body runs on. And because enzymes are precise, they become drug targets — foreshadowing a treatment that jams one machine rather than sedating a whole body.
Confirm or refute your bet: Can lying still cost a marathon’s worth of fuel?
You committed to a guess: imagined, or metabolic? Now you know energy, ATP, and enzymes. Let’s re-read the marathon-in-bed exhaustion.
Slide 7 Transcript
NEXT PART
Energy and enzymes set the stage; now the moleculesGroups of atoms bonded together. themselves walk on. First up: fuel and fat — and the fat-derived signal that travels all the way to Stina’s hypothalamusA small but vital brain region controlling hormones, temperature, and autonomic functions. and trips a fever.
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← Familial Mediterranean Fever — case home
All pages for Module 2 — Just Enough Chemistry
2.0 Module Overview
2.1 The Clue in the Blood
2.2 How Atoms Bond
2.3 Acids, Bases & the Water of Life
2.4 A Marathon Lying in Bed
2.5 Fuel and the Fever Signal
2.6 Pyrin, Built From Code
2.7 When Proteins Misfold
2.8 Conclusion and Assessment
2.9 Evidence Behind the Case
All Modules
- Anatomical Language, Membranes & Homeostasis
- Just Enough Chemistry
- The Cell & Its Transport
- Making Cells & Proteins
- The Integumentary System
- The Skeletal System
- The Muscular System
- Nervous Tissue & the Senses
- The Spinal Cord
- The Brain & the Blood–Brain Barrier
- The Autonomic Nervous System
- Special Senses (in developmentThe process of growth and differentiation.)
- The Endocrine System
- Blood
- The Heart
- Blood Vessels
- The Digestive System
- The Respiratory System
- The Urinary System
- Fluids, Electrolytes & Acid–Base Balance
- The Reproductive System
- The Immune System
List of terms
- head
- energy
- ATP
- ADP
- enzymes
- activation energy
- proteins
- denature
- molecules
- hypothalamus
- development