Analyze histology evidence
Safety gate · before any work
- Wear the required PPE, keep the bench clear, handle equipment only as directed, and know where the eyewash, sink, and spill kit are before you start.
- Human samples and data stay private: label with a code, never a name, and dispose of materials in the correct waste container, then wash your hands.
Do now
Interpret tissue and heart observations with a CER and evaluate identification limits.
- Hand in
- CER arguing what tissue damage could indicate as a cause of death, using Wednesday's microscopy observations as evidence and referencing a comparison to normal histology in the reasoning.
- Where
- Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
You get two school days for every day you were absent, so this deadline moves with you.
Looking at your own sketches next to a reference image of healthy tissue, what deviation would you point to as possible evidence of what killed this person?
Interpret and heart observations with a CER and evaluate identification limits.
- • I can interpret against references.
- • I can connect to possible pathology.
- Why can you not call a abnormal just by looking at one slide with no healthy tissue to compare it to?
- Name one thing about how a slide was made (not the itself) that could make a healthy tissue look damaged.
- 1Compare your sketches to reference images.
- 2Write a CER: what damage could indicate ?
- 3Relate one heart structure to a possible pathology.
- 4Identify two variables that affect slide interpretation.
- 5State one limitation of microscopy for determining .
What did this day actually feel like?
Analyze histology evidence
We compared our sketches to reference histology images and wrote a CER about what tissue damage could indicate as a cause of death. The reference comparison is the whole method. You cannot identify disease without knowing what healthy looks like, so a pathologist is really recognizing what is absent or distorted.
My sketches were rougher than the references and it was hard to tell whether a difference was real or just my bad drawing. I wrote that in the limitations. Mr. Mendoza said noticing that your own instrument is the weak link is a legitimate finding.
AT HOME, THE WEEKEND BEFORE MON SEP 28 Submit morgue evidence Four labeled histology sketches with magnification, the heart diagram with chambers and vessels, the CER. This packet connects the microscopic to the macroscopic, which is the actual job: tissue under a lens explaining an organ you can hold.
Turned in: full morgue packet → recorded in Class Records
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
The same day, drawn.
My sketches were rougher than the reference images, and I could not always tell if a difference was real or just my bad drawing. I wrote that down.
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
🛠 Get unstuck · pick your level
Lab day: Tier 1 is the whole class at the bench. No extension today.
🔑 Today's words · 5
Tap a word in the lesson for a plain meaning and one example. Recycled into next week's Do-Now.
Do the work · 80-minute blockfirst 5 min = hook▸
💡 Big idea: A pathologist diagnoses disease by comparing to a normal reference because appearance varies between people, so disease is recognized as deviation from normal rather than from any single slide.
- 0:00Return Wednesday lab notebooks; display reference images for all four types
- 0:10Guided comparison: walk through one type together, identifying normal vs. abnormal features
- 0:22Students compare their four sketches to references; annotate differences directly on their notebook sketches
- 0:38Heart-pathology connection: for one heart structure, research and note one associated pathology (e.g., valve thickening, chamber enlargement)
- 0:52CER writing: claim about what damage could indicate , evidence from comparison, reasoning from pathology connection
- 1:05List two slide-interpretation variables and one limitation of microscopy alone; preview Friday submission
- • Yesterday you looked at slides and sketched what you saw. Today you figure out what it means. That requires a reference, something to compare your observation to.
- • A pathologist does not just look at a slide and announce what is wrong. They compare every structure to what it should look like in a healthy sample. When something is thicker, thinner, misshapen, or missing, that is the finding.
- • We are going to do the same thing. You will compare your Wednesday sketches to reference images and ask: does this look normal? If not, what could have caused the deviation?
- • Your CER today is your argument. What does the evidence suggest about how this person might have died? You will also connect one heart structure to a possible pathology.
- • Comparison to reference images is required because appearance varies between individuals; diagnosis is based on deviation from normal, not on a single observation.
- • Two variables that affect slide interpretation are the quality of the staining (how well the dye bound to structures) and the thickness and angle of the section.
- • Microscopy alone cannot determine ; it must be combined with gross , clinical history, and toxicology for a complete picture.
Unit 1.2 Master the Morgue: Body systems, toxicology evidence, tissue microscopy, gross anatomy, preserved-heart/autopsy alternative. · Analyze evidence
Day 4 of this lesson. Open this exact section in myPLTW (find it in Clever, Microsoft sign-in), then do the work below.
Do this: In myPLTW, complete the Lesson 1.2 Master the Morgue -analysis reflection.
Mark the Lesson 1.2 -analysis reflection complete in myPLTW.
You examined slides and the heart Wednesday. By the end of today your CER and reference comparison annotations should both be done.
Annotated notebook sketches with reference comparisons and a completed CER.
The official PLTW activity stays inside myPLTW. If myPLTW will not open, use F1 and E1-E3 on this page to complete today's local evidence decision, then make up the official activity when access returns. Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
Check things off as you work, then submit. This tells Mr. Mendoza how you're doing so he can help the class. It does not replace turning in your producible through the submission route shown below.
Use the code Mr. Mendoza gave you, not your name. Saved on this device.
Unit 1.2 Master the Morgue: Body systems, toxicology evidence, tissue microscopy, gross anatomy, preserved-heart/autopsy alternative. · Analyze histology evidence
In myPLTW, complete the Lesson 1.2 Master the Morgue -analysis reflection.
You examined slides and the heart Wednesday. By the end of today your CER and reference comparison annotations should both be done.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Interpret and heart observations with a CER and evaluate identification limits.
- Compare your sketches to reference images.
- Write a CER: what damage could indicate ?
- Relate one heart structure to a possible pathology.
- Identify two variables that affect slide interpretation.
- State one limitation of microscopy for determining .
CER: CER arguing what damage could indicate as a , using Wednesday's microscopy observations as evidence and referencing a comparison to normal in the reasoning.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Use the checklist just below and upload by 11:29 PM for full credit. Absent with an excused absence? You get two school days for every day you were absent, so this deadline moves with you.
| Task | Who |
|---|---|
| Compare your sketches to reference images. | _______ |
| Write a CER: what damage could indicate ? | _______ |
| Relate one heart structure to a possible pathology. | _______ |
| Identify two variables that affect slide interpretation. | _______ |
| State one limitation of microscopy for determining . | _______ |
Working solo? Put your own name in "Who" for every row.
- I can interpret against references.
- I can connect to possible pathology.
- 1Do thisInterpret tissue and heart observations with a CER and evaluate identification limits.
- 2Use this resource
- 3Submit thisCER: CER arguing what tissue damage could indicate as a cause of death, using Wednesday's microscopy observations as evidence and referencing a comparison to normal histology in the reasoning.
- 4Submit it here
- 1Open the drop folder.
- 2Sign in with your district Microsoft account, not a personal one.
- 3Upload the file, named Lastname_Firstname__Assignment Title.
- 4Your own upload panel says Uploaded with a green check: that is your receipt.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Principles of Biomedical Technology (Principles of Biomedical Science) › Unit 1.2 Master the Morgue: Body systems, toxicology evidence, tissue microscopy, gross anatomy, preserved-heart/autopsy alternative. › CEROpen the drop folder
Learn it · deck, reading, and vocabulary▸
The deck carries the prior idea forward, lets you inspect an analogy, maps the rule to biology, and ends with the same evidence decision and exit ticket used on this page.
Generated from this lesson's canonical data with a red-team citation check.
You must record magnification on every microscopy sketch because apparent size means nothing without it, so an unlabeled sketch cannot be trusted or compared by another scientist.
A pathologist diagnoses disease by comparing to a normal reference because appearance varies between people, so disease is recognized as deviation from normal rather than from any single slide.
A mechanic studies a tool whose shape allows one job but limits another.
- Which feature makes the tool work?
- What changes if that feature bends or breaks?
- Which observation shows function rather than appearance?
Structure creates possibilities and limits for function.
Living tissues adapt and interact with other systems; a metal tool does not.
- • Tool shape maps to .
- • The job maps to physiological function.
- • Damage maps to a predicted functional change.
Driving question: Looking at your own sketches next to a reference image of healthy tissue, what deviation would you point to as possible evidence of what killed this person?
What you already know: You must record magnification on every microscopy sketch because apparent size means nothing without it, so an unlabeled sketch cannot be trusted or compared by another scientist.
New idea: A pathologist diagnoses disease by comparing to a normal reference because appearance varies between people, so disease is recognized as deviation from normal rather than from any single slide.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Analyze histology evidence. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled observation or evidence sequence before choosing an explanation.
- Observe or measure the relevant feature in Analyze evidence.
- Organize the observation with a stable evidence ID.
- Apply this rule: Structure creates possibilities and limits for function.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: Looking at your own sketches next to a reference image of healthy tissue, what deviation would you point to as possible evidence of what killed this person?
What the evidence supports: E1-E3 and F1 support the daily take-home when the response meets the stated success criteria.
What it cannot prove: The package does not support claims beyond this lesson's or any real patient diagnosis.
- • : The body's ongoing process of keeping internal conditions like temperature, blood sugar, and pH steady despite changes in the outside environment.
- • : A group of similar cells working together to perform a shared function, such as muscle, nerve, or .
- • : A group of organs that work together to carry out a major body function, such as the digestive or circulatory system.
- • toxicology: The science of how chemicals and other substances cause harm to living things, including the dose at which they become dangerous.
- • : The study of the microscopic structure of tissues, examining thin stained slices under a microscope to see how cells are arranged.
- • : The specific physiological breakdown inside the body that directly ends life, such as a fatal heart rhythm or blood loss, separate from the underlying cause.
Use it now: Choose one decision option. Cite E1 and E3, then explain how the rule connects the evidence to your choice.
Go further, optional: The source links below are optional enrichment. Every fact required for today's local evidence decision appears in this lesson package.
Comparison to reference images is required because appearance varies between individuals; diagnosis is based on deviation from normal, not on a single observation.
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
A pathologist diagnoses disease by comparing to a normal reference because appearance varies between people, so disease is recognized as deviation from normal rather than from any single slide.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
I can interpret against references.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-PBT-2026-09-25 · Simulated classroom evidence scenario
Your role: biomedical investigator
Decision: Your team must decide what the evidence from Analyze evidence supports before submitting the claim-evidence-reasoning response named on the lesson page.
- • Choose the strongest supported explanation.
- • Choose the next evidence to collect.
- • Hold the decision because the evidence is insufficient.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the claim-evidence-reasoning response.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Analyze evidence. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Reason for review: Your team must decide what the evidence from Analyze evidence supports before submitting the claim-evidence-reasoning response named on the lesson page.
Context: Diagnosis works by comparison to normal, so a pathologist recognizes disease by what is missing or distorted, not by any single observation alone.
- • T1: Compare your sketches to reference images.
- • T2: Write a CER: what damage could indicate ?
- • T3: Relate one heart structure to a possible pathology.
- • T4: Identify two variables that affect slide interpretation.
- • T5: State one limitation of microscopy for determining .
- • E1: Comparison to reference images is required because appearance varies between individuals; diagnosis is based on deviation from normal, not on a single observation.
- • E2: A pathologist diagnoses disease by comparing to a normal reference because appearance varies between people, so disease is recognized as deviation from normal rather than from any single slide.
- • E3: I can interpret against references.
Measurements: No patient measurement is supplied unless it appears explicitly in E1-E3 or F1. Do not invent a value.
Figure finding: Teaching diagram for Analyze evidence. Trace the labeled observation or evidence sequence before choosing an explanation. This is a teaching model, not patient or experimental data.
Uncertainty: This is a composite classroom scenario. Missing history, measurements, or confirmation tests remain unknown and limit the conclusion.
Students often think Students think an experienced pathologist can look at one slide alone and just know it is diseased, the way you know a bruise when you see one.. The trap: That is a trap because appearance varies between individuals, so diagnosis is based on deviation from normal reference tissue, not a single observation; a bad stain or a thick section can mimic disease if you have nothing to compare against.
Claim: The latent print lifted from the scene could indicate that this individual touched the surface before the incident.\nEvidence: Compared to a known reference print taken directly from the individual, the latent print showed the same pattern of ridge endings and bifurcations in the same relative positions, which are the features examiners use to match prints.\nReasoning: Identification is based on agreement between an unknown sample and a known reference, so the side-by-side comparison is what makes the matching ridge features meaningful. A shared arrangement of ridge endings and bifurcations is consistent with both prints coming from the same finger.\nLimitation: A partial or smudged latent print cannot confirm identity on its own; it must be combined with the quality of the reference print, the number of matching features, and other case evidence before a firm conclusion is reached.
This model shows the level of evidence and organization needed to complete: A claim-evidence-reasoning paragraph modeling how a forensic examiner argues an identification from comparison to a reference, so students can copy the CER structure and depth without it answering today's histology question.
- Write one defensible claim.
- Choose specific evidence that supports the claim.
- Explain the scientific rule that connects the evidence to the claim.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Upload your CER and annotated notebook page to the tracker by end of class.
- CER:
- Claim, Evidence, Reasoning: make a claim, back it with evidence, explain your reasoning.
- SOP:
- Standard Operating Procedure, the exact steps to follow (especially in a lab).
- Tracker:
- Your PLTW progress log where you record completed evidence.
- myPLTW:
- The PLTW course site where you do the online activities. Find it in Clever with your Microsoft sign-in, right next to Schoology.
Tap the speaker to hear a term. Add two of these to your notebook glossary with a definition and an example in your own words.
Pick just 2 or 3 words from today and make them yours: write what each one means in your own words, name the context clue or evidence that helped, then give one example from what you actually did in Analyze histology evidence. Try your own words first; the glossary is there if you get stuck. This is voluntary and counts as extra credit, so keep it short.
Saved on this device. Show Mr. Mendoza or add these to your notebook glossary to claim the extra credit.
Hand-picked readings and interactives for this lesson, from authoritative open organizations and PLTW's own public course outline.
Check yourself · commit, then reveal▸
Claim ceiling for this check: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Analyze evidence. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Name two things about how a slide is prepared, not the tissue itself, that could make you misread whether a tissue is normal or diseased.
Write an answer and pick a confidence to unlock the key.
Fast retrieval with instant answers, not the commit-then-reveal check above. Try each from memory first: write what you remember about the earlier units, then check yourself here.
Go further and get help▸
I can name the procedure's purpose and the evidence I will record. I can identify each named hazard and the control that reduces it: Wear the required PPE, keep the bench clear, handle equipment only as directed, and know where the eyewash, sink, and spill kit are before you start. My data table is ready before materials are handled.
Finish the checklist before you handle any material.
- • Wear the required PPE, keep the bench clear, handle equipment only as directed, and know where the eyewash, sink, and spill kit are before you start.
- • Human samples and data stay private: label with a code, never a name, and dispose of materials in the correct waste container, then wash your hands.
- 1Before materials are handled, identify the purpose, variables or comparison, controls, measurement units, and stop-work condition.
- 2Compare your tissue sketches to reference histology images.
- 3Write a CER: what tissue damage could indicate cause of death?
- 4Relate one heart structure to a possible pathology.
- 5Identify two variables that affect slide interpretation.
- 6State one limitation of microscopy for determining cause of death.
- 7Record each result in the prepared table before interpreting it. Mark missing, repeated, or invalid results truthfully.
- 8Complete the named cleanup and waste route, remove PPE safely, wash hands when required, and confirm the station is ready for the next group.
| Trial or sample ID | Independent condition | Measured result with units | Observation before interpretation | Quality-control note |
|---|---|---|---|---|
Before the procedure, predict the result and cite the rule behind the prediction.
After the procedure, compare the result with the prediction and name one limitation or source of uncertainty.
What today's skills lead to. These are real health-science careers this course builds toward. Tap one to see, on the US Department of Labor's O*NET site, what the job actually involves, what it pays, and how fast it is growing.
The bench work needs equipment you do not have at home. Do the thinking half now: read the procedure, write your prediction, and set up your data table so it is ready.
Back in class. Ask Mr. Mendoza for the class data set, or for a bench slot to run it yourself. Do not submit a CER with invented numbers.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
Khan Academy: human body systems (Health and medicine)- CompleteEvery required part of the artifact is present, nothing left blank.
- AccurateThe science and the data are correct and match the evidence.
- Scientific reasoningYou explain your claim with evidence and reasoning (CER), not just an answer.
- Professional communicationClear, organized, labeled, and written the way a clinician or scientist would.
- SubmittedTurned in the right way, on the class site or handed to Mr. Mendoza in class, and confirmed. Not in Schoology: that is where the report-card grade appears later.
- Error analysis and method · counts doubleName a specific limit of the method and how it moved your result, and compare what you predicted to what happened. "Human error" does not count; say what about the procedure or instrument caused it.