Muscle action analysis
Do now
Analyze agonist and antagonist muscle pairs and revise your model labels.
- Hand in
- Agonist-antagonist-synergist analysis for one chosen movement, plus a revised Maniken label card showing each muscle's role.
- 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.
When you bend your elbow, your biceps contracts, but what is the triceps doing at that exact moment, and why would a big strength gap between the two lead to overuse injury?
Analyze agonist and antagonist muscle pairs and revise your model labels.
- • You can identify agonist and antagonist muscles for a movement.
- • You can revise model labels to show muscle roles.
- When your biceps contracts to bend your elbow, is your triceps contracting too, relaxing, or doing nothing?
- What do we call the muscle that is the prime mover for a movement, versus the one that opposes it?
- 1Read the notes on agonist, antagonist, and synergist roles in movement.
- 2Choose one movement and identify the agonist and antagonist muscles.
- 3Complete the PLTW online task on muscle pairing.
- 4Revise your Maniken labels to mark each muscle's role in one movement.
- 5Submit your agonist-antagonist analysis and revised labels.
What did this day actually feel like?
Muscle action analysis
Agonist, antagonist, synergist. Nothing in the body moves by one muscle contracting. One pulls, one resists, others stabilize, and the resistance is what makes the movement controlled instead of a spasm.
I picked elbow flexion and traced the pair. Then I had to revise my Maniken label card, because analyzing the movement showed me I had labeled one insertion wrong on Wednesday.
AT HOME, THE NIGHT BEFORE THU FEB 25 Submit muscle evidence Sarcomere diagram, Maniken photos, muscle pair analysis. The packet works across scales, from filaments sliding to a whole joint moving, which is the point of the week.
Turned in: muscle 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.
Agonist, antagonist, synergist. Nothing in the body moves by one muscle contracting. One pulls, one resists, others stabilize, and the resistance is what makes the movement controlled instead of a spasm.
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: Because a muscle can only pull, controlled movement needs an agonist that contracts and an antagonist that relaxes, so a strength imbalance between the pair invites overuse injury.
- 0-8Intro: agonist, antagonist, synergist definitions with elbow example
- 8-25Notes: muscle pairing logic and three roles
- 25-45PLTW online task: muscle pairing
- 45-62Choose one movement; identify agonist, antagonist, and synergist
- 62-75Revise Maniken label card to mark roles; submit revised photo or diagram
- 75-80Class share: which movements produced the most disagreement?
- • Yesterday you placed muscles. Today you explain how they cooperate. No muscle works alone.
- • For every movement, one muscle is the prime mover, another resists, and one or more stabilize the . Those roles have names.
- • You will pick one movement from your Maniken build and label every muscle involved by its role. Then you revise the Maniken labels to match.
- • This analysis is the kind of thinking physical therapists and athletic trainers use every day.
- • Agonist: the prime mover contracting to produce a specific movement. Antagonist: the muscle on the opposing side that relaxes and resists. Synergist: stabilizes the during the movement.
- • Classic pair: biceps brachii (agonist, elbow ) and triceps brachii (antagonist). Reversed for elbow extension.
- • Muscle imbalance between agonist and antagonist pairs is a common cause of overuse injury and movement dysfunction.
Unit 1.2 Muscles and Motion: Muscle contraction, muscle orientation, Maniken muscle build, movement and biomechanics. · Muscle action analysis
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: Complete the agonist-and-antagonist analysis task in Lesson 1.2 Muscles and Motion on myPLTW; use it to check your model labels during the analysis window.
Mark the agonist-antagonist task complete after submitting your revised model labels.
Maniken task is done; today the analysis task should show complete and your revised labels should be submitted.
myPLTW completion status plus submitted revised label sheet.
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 Muscles and Motion: Muscle contraction, muscle orientation, Maniken muscle build, movement and biomechanics. · Muscle action analysis
Complete the agonist-and-antagonist analysis task in Lesson 1.2 Muscles and Motion on myPLTW; use it to check your model labels during the analysis window.
Maniken task is done; today the analysis task should show complete and your revised labels should be submitted.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Analyze agonist and antagonist muscle pairs and revise your model labels.
- Read the notes on agonist, antagonist, and synergist roles in movement.
- Choose one movement and identify the agonist and antagonist muscles.
- Complete the PLTW online task on muscle pairing.
- Revise your Maniken labels to mark each muscle's role in one movement.
- Submit your agonist-antagonist analysis and revised labels.
Notebook check: Agonist-antagonist-synergist analysis for one chosen movement, plus a revised Maniken label card showing each muscle's role.
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 notes on agonist, antagonist, and synergist roles in movement. | _______ |
| Choose one movement and identify the agonist and antagonist muscles. | _______ |
| Complete the PLTW online task on muscle pairing. | _______ |
| Revise your Maniken labels to mark each muscle's role in one movement. | _______ |
| Submit your agonist-antagonist analysis and revised labels. | _______ |
Working solo? Put your own name in "Who" for every row.
- You can identify agonist and antagonist muscles for a movement.
- You can revise model labels to show muscle roles.
- 1Do thisAnalyze agonist and antagonist muscle pairs and revise your model labels.
- 2Use this resource
- 3Submit thisNotebook check: Agonist-antagonist-synergist analysis for one chosen movement, plus a revised Maniken label card showing each muscle's role.
- 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. Human Anatomy & Physiology (Human Body Systems) › Unit 1.2 Muscles and Motion: Muscle contraction, muscle orientation, Maniken muscle build, movement and biomechanics. › Notebook checkOpen 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.
A muscle can only pull its toward its origin, so the placement of those two points determines which bone moves and in which direction.
Because a muscle can only pull, controlled movement needs an agonist that contracts and an antagonist that relaxes, so a strength imbalance between the pair invites overuse injury.
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: When you bend your elbow, your biceps contracts, but what is the triceps doing at that exact moment, and why would a big strength gap between the two lead to overuse injury?
What you already know: A muscle can only pull its toward its origin, so the placement of those two points determines which bone moves and in which direction.
New idea: Because a muscle can only pull, controlled movement needs an agonist that contracts and an antagonist that relaxes, so a strength imbalance between the pair invites overuse injury.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Muscle action analysis. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled structure, movement, or system relationship that connects form to function.
- Observe or measure the relevant feature in Muscle action analysis.
- 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: When you bend your elbow, your biceps contracts, but what is the triceps doing at that exact moment, and why would a big strength gap between the two lead to overuse injury?
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 basic contracting unit of a muscle fiber, made of overlapping and filaments that slide past each other to shorten the muscle.
- • : A that forms thin filaments inside cells and slides past to produce muscle and cell movement.
- • : A motor in muscle whose heads grab and pull on filaments, producing the sliding motion that contracts the muscle.
- • : The shortening of a muscle as its fibers pull together, generating force to move bones, pump blood, or squeeze organs.
- • : A tough band of that anchors a muscle to a bone, transferring the muscle's pull so the bone can move.
- • origin: The fixed, anchoring attachment point of a muscle on a bone, which stays still while the muscle pulls on its other end.
- • : The end of a skeletal muscle attached to the bone that moves when the muscle contracts, as opposed to the more fixed origin end.
- • lever: A rigid bar that pivots at a fixed point to move a load, the simple machine that bones, joints, and muscles form to create movement.
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.
Agonist: the prime mover contracting to produce a specific movement. Antagonist: the muscle on the opposing side that relaxes and resists. Synergist: stabilizes the during the movement.
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
Because a muscle can only pull, controlled movement needs an agonist that contracts and an antagonist that relaxes, so a strength imbalance between the pair invites overuse injury.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
You can identify agonist and antagonist muscles for a movement.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-HAP-2027-02-24 · Simulated classroom evidence scenario
Your role: anatomy and physiology consultant
Decision: Your team must decide what the evidence from Muscle action analysis supports before submitting the notebook record 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 notebook record.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Muscle action analysis. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Rate or percent = part / comparison total x 100%. Percent change = (new - comparison) / comparison x 100%.
If 18 of 60 records meet a condition, the frequency is 18 / 60 x 100% = 30%.
Name the comparison total. A percent describes the supplied group and does not automatically predict an individual's outcome.
Use today's supplied counts to calculate one rate, risk, frequency, or percent change. Show the denominator and interpretation.
Students often think Students think the agonist and antagonist both contract hard at the same time, fighting each other during a movement.. The trap: They do not both contract fully. The agonist contracts to make the movement while the antagonist relaxes and lengthens to allow it. If both fully contracted at once, the would lock and no movement would happen. A synergist, separately, stabilizes the joint.
Chosen movement: bending the elbow (elbow flexion).
- Agonist (prime mover): biceps brachii. It contracts to flex the elbow.
- Antagonist: triceps brachii. It relaxes and lengthens to allow flexion; it would resist or reverse the movement.
- Synergist: brachialis. It assists the biceps and helps stabilize the elbow during flexion.
Reversed movement (elbow extension): the roles flip. The triceps becomes the agonist and the biceps becomes the antagonist.
Revised label card: I marked the biceps on my Maniken as AGONIST for flexion and the triceps as ANTAGONIST, and added a note that the labels swap for extension.
Why it matters: When the agonist and antagonist of a pair are unbalanced, the joint is more prone to overuse injury, which is why physical therapists train both sides of a pair.
This model shows the level of evidence and organization needed to complete: An analysis of one joint movement that names the agonist, antagonist, and synergist, plus a revised model label card showing each muscle's role in that movement.
- Date and label the entry.
- Record the procedure, observation, or design decision clearly.
- End with what the evidence means and the next step.
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 analysis and revised label card as a single document or photo.
- 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 Muscle action analysis. 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, videos, and interactives for this lesson, all free and from authoritative open organizations (NIH, CDC, OpenStax, Khan Academy, PhET, HHMI, and more).
A fillable, Cornell-style notebook for Unit 1: Road to Rehabilitation. Type your notes, cues, and summaries right in the PDF, or print it and write by hand. Each lesson page has a cue column, a notes column, and a summary box, plus dated lab-record pages you can turn in.
HBS Unit 1 notebook: Road to Rehabilitation Fillable PDFCornell notes + lab recordsOpenVetted readings and references for this unit. Use them to prepare, to catch up if you were absent, or to go deeper on today's target.
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 Muscle action analysis. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
During elbow flexion (bending the arm), name the agonist and the antagonist, and state what each one is doing.
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 Notebook check.
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: Muscular System- 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.