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Module 14 · Anatomy & Physiology II
The acute-phase response as a slow fuse.
A platelet count that jumps with every flare, a neutrophil surge with nothing growing, markers raised for twenty years, a serum amyloid A nobody ordered — and one red-cell finding that fits nothing. This module builds blood in anatomy’s own words, from the spun tube and the smear at 40× to the marrow, the cascade and the five defenders on the site’s own slides, and reads six odd labs as one sustained alarm with a long fuse, one thread held open, and one clone held apart.
The module’s question
A response built to run for days has been running for decades. What does it manufacture besides markers — and how do you tell the findings it explains from the two it cannot?
Module trailer · about 2 minutes
The Acute-Phase Response as a Slow Fuse — narrated, with captions and a full text description.
The module trailer. Watch it first.
Animation · in production · 2 min
The Acute-Phase Response as a Slow Fuse
Two minutes: a hematocritThe percentage of blood volume occupied by red blood cells. explained away five times, a tube with three layers, a gel with five peaks and a sixth, a cell with no nucleusThe control center of the cell that contains DNA and directs cellular activities., a hormone that counts oxygen, confetti from a giant, five defenders in ten seconds each, and a protein that is also a building material.
How every chapter works
- Animation (dark teal) — a short animated explainer, one idea each
- Slide (dark teal) — a still to study: a micrograph, a diagram or a map
- Explore (purple) — something to push on while you watch
- Game (purple) — a quick challenge
- Think (gold) — reason it out, then spot-check yourself with a few true/false questions; not graded
- Check (gold) — a quick H5P that scores itself
Read the chart and make a private prediction → the story → the scenes → sort your evidence → build your verdict → the finding. Nothing is graded, nothing is recorded, nothing is locked.
Where this module sits in Stina’s life
1986 · 11
Fevers begin; ESR “a touch high”
2006 · 31
First high hematocrit: “dehydration”
2013 · 38
“Perimenopause” · Clue #13
2015 · 40
SPEP → MGUS · the blood workup · Clue #14
Nov 2016 · 41
Fever of unknown origin
2026 · 51
FMF named; AA amyloid in gut and kidney
Ochre = chart clue · Purple = diary entry.
The case this module reads
Forty, in the middle of the digestive marathon. An immunologist chasing the fevers runs a serum protein electrophoresis and finds a narrow spike in the gamma region: IgG kappa, 0.6 grams per decilitre. The first oncologist: no symptomsSubjective experiences reported by the patient (e.g., nausea, fatigue)., we’ll watch it. She asks what the fever is from. The second oncologist keeps the MGUS and opens the rest of the chart: a hematocrit high on five draws in nine years, each one filed as dehydrationA condition in which fluid loss exceeds intake, leading to a decrease in total body water.; platelets that climb with every flare; neutrophils that surge with nothing growing; an ESR and a CRP that have never come down; a serum amyloid A nobody had measured. The workup: red-cell mass high, EPO high with normal oxygen, JAK2 negative, marrow normal but for a six-percent clone. Four findings turn out to be one alarm. One is held open. One is held apart.
Patient chart · Stina · Chart Clue #14
Alarm
Platelets 560 at flares · neutrophils 78% with bands, cultures sterile
Markers
ESR 58 · CRP 41 · SAA 190 (38 between) · fibrinogen plasma protein converted into fibrin during blood clotting. 520 · albuminA plasma protein that helps maintain osmotic pressure and transport substances. 3.6
Open thread
Hct 49 · EPO 44 at SpO₂ 98% · JAK2 negative
Clone
IgG-κ M-spike 0.6 g/dL · plasma cellsImmune cells that develop from B cells and produce antibodies. 6%
Told
“Dehydration.” “Reactive.” “A touch high.” “No symptoms.”
Seven chapters, seven decisions
Each chapter opens on the chart and ends with a verdict you build from evidence. Work them in order — later chapters assume the cards you collected earlier.
1
14.1 The Red Cell Finding That Fits Nothing
A body builds extra red cellsThe basic structural and functional units of life. when it is short of oxygen. Hers is not. Before you can say why her marrow keeps building, you need to know what blood is, what a spun tube shows, and what a high hematocrit can and cannot mean.
You decide: dehydration, inflammation, or a real surplus?
2 animations · 3 slides · 5 things to explore · 10 quick checks · 1 verdict
2
14.2 What’s in Blood
Her inflammation has been running for two decades and her liverA large organ that produces bile, detoxifies blood, and stores nutrients. has been listening the whole time. Would a liver under a constant inflammatory signal make more of everything, less of everything — or trade one set of proteinsLarge molecules made of amino acids with various functions in the body. for another?
You decide: more of everything, less, or a trade?
3 animations · 2 slides · 5 things to explore · 10 quick checks · 1 verdict
3
14.3 Red Cells and Hemoglobin
If each of her red cells is normal — right size, right colour, right hemoglobinThe oxygen-carrying protein in red blood cells that gives blood its red color., right shape — and there are simply too many of them, which part of the machinery is the question about: the cell, the cargo, or the count?
You decide: the cell, the cargo, or the count?
2 animations · 3 slides · 5 things to explore · 10 quick checks · 1 verdict
4
14.4 Making and Recycling Red Cells
Every part of the machinery works — marrow, spleen, iron, bilirubinA yellow pigment produced from the breakdown of hemoglobin, excess amounts cause jaundice. — and there are too many red cells. Is the factory over-producing on its own, or is somebody sending it an order it should never have received?
You decide: a factory on its own, or an order?
3 animations · 2 slides · 5 things to explore · 10 quick checks · 1 verdict
5
14.5 The Clotting Story
Her cascade works, her vitamin K is fine, her clotting times are normal — and her platelets climb with every flare. Is that a marrow making platelets on its own, or something ordering them?
You decide: a marrow disorder, or a count on the wrong page?
3 animations · 2 slides · 5 things to explore · 10 quick checks · 1 verdict
6
14.6 The Defenders
A high neutrophil count usually means bacteria. Her flares produce exactly that pattern and exactly nothing grows. Are her neutrophils defective, is there a hidden infection — or are they answering a signal that has nothing to do with a germ?
You decide: a hidden infection, defective cells, or an internal alarm?
2 animations · 3 slides · 5 things to explore · 10 quick checks · 1 verdict
7
14.7 The Acute-Phase Alarm
Six odd labs across twenty years — six findings, or one process that never switched off, plus the discipline to say which findings it cannot explain?
You decide: six findings, or one alarm, one thread, one clone?
3 animations · 2 slides · 5 things to explore · 10 quick checks · 1 verdict
14.8 · Conclusion and Assessment
The module verdict, then everything to practice
14.9 · The Evidence Behind the Case
Check our reasoning against the literature
Stina’s diary
The entries behind this module
“Nobody can tell” (36) · “Perimenopause” (38) · “Undetermined significance” (40) · “Fever of unknown origin” (41) · “Negative” (42).
The original lectures and histology
Ten mini-lectures, two affinity pages, eight histology pages, five simulated labs, one case
Every original blood mini-lecture on bettybroadbent.com (Characteristics through Blood Typing) is linked from the scene it belongs to, with the respiratory hemoglobin-affinity pages, the histology hub, the Guided Journey and the six cell pages, the bone-marrow page, the CBC page, the five simulated labs embedded as-is, the glossary and flashcard maker, the disease flip cards and Maude’s pernicious-anemia case.
By the end you can
- Describe the composition and physical characteristics of whole blood, explain why it is a connective tissue, use its vocabulary (formed elementsThe cellular components of blood, including red blood cells, white blood cells, and platelets., erythrocytes(RBCs): Red blood cells responsible for oxygen transport., leukocytes, thrombocytes, plasmaThe liquid component of blood., serum, buffy coatThe thin layer of white blood cells and platelets between plasma and red blood cells in centrifuged, hematocrit), and read a spun tube and a stained smear.
- Describe plasma and its three protein families, their origins and jobs, read a serum protein electrophoresis, and explain the acute-phase response and its positive and negative reactants.
- Describe erythrocyte structure and hemoglobin, explain cooperative binding and the dissociation curve, distinguish the measured from the calculated CBC values, and name abnormal red-cell shapes and what they mean.
- Trace erythropoiesisThe process of red blood cell production. from hemocytoblast to disc, explain the EPO feedback loop and the reticulocyteAn immature red blood cell released from the bone marrow. count, follow the breakdown of a red cell, and sort the anemias and polycythemias by mechanism.
- Describe platelets and hemostasis from vascular spasm to fibrinolysis, the two coagulation pathways and their common end, the limits on clotting and the drugs that act on it, and the ABO and Rh systems and transfusion safety.
- Identify the five leukocytes on a smear, describe diapedesis and the differential, and explain leukopoiesis and the marrow as a lymphoid organ.
- Read a blood smear systematically, compare CRP and the ESR, relate chronic serum amyloid A to AA amyloid, and distinguish the findings a sustained acute-phase response explains from those it cannot.
Reliable information on rare diseases
NORD · NIH GARD · Orphanet · MedlinePlus Genetics: FMF · FMF & AID Global Association · Autoinflammatory Alliance · Global Genes · Amyloidosis Foundation
Stina has one rare disease. In the United States, about 1 in 10 people live with one of the more than 7,000 known rare diseases. These organizations are where patients, families and clinicians go for trustworthy information.
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← Familial Mediterranean Fever — case home
All pages for Module 14 — Blood
14.0 Module Overview
14.1 The Red Cell Finding That Fits Nothing
14.2 What’s in Blood
14.3 Red Cells and Hemoglobin
14.4 Making and Recycling Red Cells
14.5 The Clotting Story
14.6 The Defenders
14.7 The Acute-Phase Alarm
14.8 Conclusion and Assessment
14.9 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
- hematocrit
- nucleus
- symptoms
- dehydration
- fibrinogen
- albumin
- plasma cells
- cells
- liver
- proteins
- hemoglobin
- bilirubin
- formed elements
- erythrocytes
- plasma
- buffy coat
- erythropoiesis
- reticulocyte
- development