Physiology variables
Do now
Launch Problem 2 by identifying variables for a human physiology research design.
- Hand in
- Problem 2 launch: chosen physiological measure, identified independent/dependent/controlled variables, and a testable hypothesis.
- 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.
If you want to study how something affects heart rate, exactly which variable do you change, which do you measure, and which do you have to keep constant?
Launch Problem 2 by identifying variables for a human physiology research design.
- • You can name independent, dependent, and controlled variables.
- • You can write a testable physiology hypothesis.
- Your resting heart rate and your heart rate after climbing stairs are different numbers. Name the one thing that changed to cause it.
- If you wanted to test whether music changes heart rate, what would you have to keep the same for both listeners?
- 1Read the Problem 2 physiology overview.
- 2Choose a physiological measure to investigate, such as heart rate.
- 3Identify the independent, dependent, and controlled variables.
- 4Write a testable hypothesis about your measure.
- 5Submit your variables and hypothesis.
What did this day actually feel like?
Physiology variables
New problem. Human physiology, and what you can actually measure on a person in a classroom: heart rate, reaction time, grip strength, breathing rate.
Turned in: exit ticket → Exit Tickets folder
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.
New problem. Human physiology, and what you can actually measure on a person in a classroom: heart rate, reaction time, grip strength, breathing rate.
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
🔑 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: You must define your variables and a testable hypothesis first so that your measurements mean something, because an undefined study cannot tell you what actually caused a change.
- 0-10Introduce Problem 2: physiology investigation overview and evidence expectations
- 10-25Read the Problem 2 physiology overview and discuss physiological measures worth studying
- 25-40Choose a measure and identify independent, dependent, and controlled variables
- 40-60Write a testable hypothesis linking the to the dependent measure
- 60-75Submit your variables and hypothesis
- 75-80Pair-check: does your partner's hypothesis have all three variable types? Give one piece of feedback.
- • Problem 1 is complete. Problem 2 asks you to investigate human physiology using real data.
- • Today you launch Problem 2 by choosing a physiological measure and designing a testable hypothesis around it.
- • Getting the variables right now prevents weeks of wasted data collection later.
- • Molecular and Genetic Technology and Microbiology Testing on WebXam 072125 both require experimental design fluency.
- • The definitions of independent, dependent, and controlled variables and how to apply them to a physiology investigation.
- • What makes a hypothesis testable rather than merely a guess.
- • Why choosing a measurable physiological variable -- such as heart rate -- is the first constraint that shapes the entire study design.
Evidence-based revision, Q&A, intro to physiology research design. · Physiology variables
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: Open Problem 2 Exploring Human Physiology in your myPLTW course shell and locate the variable-identification and hypothesis activity.
Mark the variable and hypothesis activity complete in your tracker after submitting your work.
Problem 1 is fully closed out; today you launch Problem 2 by identifying variables and writing your first physiology hypothesis.
Written variable identification (independent, dependent, controlled) and a testable physiology hypothesis turned in on the class site or in person.
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.
Evidence-based revision, Q&A, intro to physiology research design. · Physiology variables
Open Problem 2 Exploring Human Physiology in your myPLTW course shell and locate the variable-identification and hypothesis activity.
Problem 1 is fully closed out; today you launch Problem 2 by identifying variables and writing your first physiology hypothesis.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Launch Problem 2 by identifying variables for a human physiology research design.
- Read the Problem 2 physiology overview.
- Choose a physiological measure to investigate, such as heart rate.
- Identify the independent, dependent, and controlled variables.
- Write a testable hypothesis about your measure.
- Submit your variables and hypothesis.
Exit ticket: Problem 2 launch: chosen physiological measure, identified independent/dependent/controlled variables, and a testable hypothesis.
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 |
|---|---|
| Read the Problem 2 physiology overview. | _______ |
| Choose a physiological measure to investigate, such as heart rate. | _______ |
| Identify the independent, dependent, and controlled variables. | _______ |
| Write a testable hypothesis about your measure. | _______ |
| Submit your variables and hypothesis. | _______ |
Working solo? Put your own name in "Who" for every row.
- You can name independent, dependent, and controlled variables.
- You can write a testable physiology hypothesis.
- 1Do thisLaunch Problem 2 by identifying variables for a human physiology research design.
- 2Use this resource
- 3Submit thisExit ticket: Problem 2 launch: chosen physiological measure, identified independent/dependent/controlled variables, and a testable hypothesis.
- 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. Biotechnology for Health (Biomedical Innovations) › Evidence-based revision, Q&A, intro to physiology research design. › Exit ticketOpen 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 answer questions from your own evidence so that the panel trusts your design is real, because a confident guess that proves wrong destroys credibility instantly.
You must define your variables and a testable hypothesis first so that your measurements mean something, because an undefined study cannot tell you what actually caused a change.
A bridge prototype is tested against a load limit, cost limit, and user need before revision.
- Which requirement is a criterion?
- Which limit is a constraint?
- What test result should trigger a redesign?
A design improves when evidence is compared with explicit criteria and constraints.
Biomedical designs also require , ethics, and biological validation beyond a physical prototype test.
- • Bridge requirements map to design criteria.
- • Load results map to E1-E3.
- • Revision maps to the next evidence-based iteration.
Driving question: If you want to study how something affects heart rate, exactly which variable do you change, which do you measure, and which do you have to keep constant?
What you already know: You must answer questions from your own evidence so that the panel trusts your design is real, because a confident guess that proves wrong destroys credibility instantly.
New idea: You must define your variables and a testable hypothesis first so that your measurements mean something, because an undefined study cannot tell you what actually caused a change.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Physiology variables. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled system, test, or design relationship and identify which evidence should trigger revision.
- Observe or measure the relevant feature in Physiology variables.
- Organize the observation with a stable evidence ID.
- Apply this rule: A design improves when evidence is compared with explicit criteria and constraints.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: If you want to study how something affects heart rate, exactly which variable do you change, which do you measure, and which do you have to keep constant?
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.
- • iteration: One repeated cycle of building, testing, and improving, where each pass refines the design or result based on what the last pass revealed.
- • feedback: A loop in which the output of a process feeds back to adjust the process itself, either damping change (negative) or amplifying it (positive).
- • usability: How easy, efficient, and satisfying a product is for its intended users to learn and use to reach their goals.
- • hypothesis: A testable, falsifiable prediction about how variables relate, written so an experiment can support it or prove it wrong.
- • variable: Any factor in an experiment that can change or be changed, including what you test, what you measure, and what you hold steady.
- • control: The comparison condition that isolates the effect of the variable being tested by keeping everything else the same.
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.
The definitions of independent, dependent, and controlled variables and how to apply them to a physiology investigation.
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
You must define your variables and a testable hypothesis first so that your measurements mean something, because an undefined study cannot tell you what actually caused a change.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
You can name independent, dependent, and controlled variables.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-BFH-2027-02-26 · Simulated classroom evidence scenario
Your role: biomedical design team member
Decision: Your team must decide what the evidence from Physiology variables supports before submitting the exit response named on the lesson page.
- • Keep the current design.
- • Revise the feature that misses a criterion.
- • Run one more fair test before choosing.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the exit response.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Physiology variables. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Mean = sum of values / number of values. Median = middle ordered value. Range = maximum - minimum.
For 2, 4, 4, and 10: mean = 20 / 4 = 5, median = 4, and range = 10 - 2 = 8.
Mean, median, and range keep the measurement unit. Order the values before finding the median.
Calculate the requested summary for today's supplied values, then write what it reveals and what it hides.
- • The solution must address the stated need in Physiology variables.
- • The decision must be supported by E1-E3.
- • The final product must make the success criteria visible.
- • Complete the work inside the 80-minute block.
- • Use only supplied or teacher-approved materials and evidence.
- • Do not trade , accessibility, or privacy for speed.
- • and evidence quality: must pass before scoring other criteria.
- • User need and effectiveness: highest scored criterion.
- • Time, cost, and ease of use: compare only after and effectiveness pass.
Test evidence: For each option, record the E1-E3 result that supports or fails each criterion. Do not assign a score without a named observation.
- Version or option tested
- Criterion met or missed
- Evidence ID and result
- Revision made
- Reason for the revision
- Need and user
- Criteria and constraints
- Chosen option and evidence
- Test result
- Revision and reason
Students often think Students often think the is whatever they measure with an instrument, so they call heart rate the independent variable because that is the number they collect.. The trap: That is a trap because heart rate is the ; it responds. The is the thing you deliberately change, such as exercise or music, and mixing them up means your whole study answers the wrong question.
Problem 2 launch: variables and hypothesis
Physiological measure I will investigate: heart rate.
Variables:
- Independent (what I change): exercise level, sitting at rest versus 2 minutes of step-ups.
- Dependent (what I measure): heart rate in beats per minute.
- Controlled (what I keep the same): same person, same time of day, same step height and pace, 1-minute rest before each reading.
Testable hypothesis: If a person does 2 minutes of step-ups, then their heart rate will increase compared to their resting rate, because exercise raises the body's demand for oxygen and the heart pumps faster to meet it.
Why this is testable: it predicts a measurable change (heart rate) tied to a variable I control (exercise level), so I can confirm or disconfirm it with data.
This model shows the level of evidence and organization needed to complete: A Problem 2 launch ticket naming a physiological measure, its independent, dependent, and controlled variables, and a testable hypothesis.
- Name the prompt or task.
- Answer it directly with the key evidence.
- Check that the response matches the requested format.
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: Submit your variables and hypothesis on the class site, or hand it to Mr. Mendoza in class by end of period.
- 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 Physiology variables. 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.
Classroom documents for this lesson are posted in Schoology. Open Clever, then Schoology, and find each one by the name shown on its card.
Use this if you were absent, got stuck, or need another pass before you submit the lesson artifact.
Placement rationale
Matched ER presentation and physiology bridge by path:Biomedical-Innovations/Problem-1_Emergency-Room/1.1_Emergency-Room; keywords:emergency room, clinical. Score 142. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Open this when the class reaches this activity and use it to complete the required lesson artifact.
Placement rationale
Matched ER presentation and physiology bridge by path:Biomedical-Innovations/Problem-2_Human-Physiology/2.1_Human-Physiology; keywords:physiology. Score 134. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Open this when the class reaches this activity and use it to complete the required lesson artifact.
Placement rationale
Matched ER presentation and physiology bridge by path:Biomedical-Innovations/Problem-2_Human-Physiology/2.1_Human-Physiology; keywords:physiology. Score 134. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
How to get there: open Clever and sign in with your Microsoft (district) account. Both myPLTW and Schoology are in Clever. Do the activity in myPLTW. Turn the work in on this site or hand it to Mr. Mendoza, because that is the step that counts as submitted. Schoology only shows your report-card grade later.
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 Physiology variables. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
You test whether caffeine raises heart rate. Which is the independent variable and which is the dependent variable?
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▸
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.
Today is individual work you can do from home: complete the same target above, then submit your Exit ticket.
Open the drop folderTurn 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.
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 Scientific Method- 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.