Muscle action analysis
Wed, Feb 24, 2027 · Week 6 · Human Anatomy & Physiology (Human Body Systems)
Today's goal: Analyze agonist and antagonist muscle pairs and revise your model labels.
This is a model of the work you should turn in today. Use it to check your own: match the structure and the level of detail, do not copy it. Your data and wording should be your own.
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.
Turn in: Agonist-antagonist analysis and revised labels
Go to Schoology to turn this in.
Submit one PDF. Put your first and last name in the document header. Name the file: FirstName LastName - Assignment Title - YYYY-MM-DD.pdf.
Open Schoology PDF upload helpIf you cannot get in, see Mr. Mendoza. Do not skip the work.
Claim ceiling: Today's evidence supports a classroom claim about muscle action analysis. It cannot prove causation, diagnose a real patient, or justify action outside this room.
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.
It builds this reusable test skill: Identifying the antagonist muscle for a given movement.
- Name the concept or data pattern being tested.
- Cross out choices that violate that rule or the evidence.
- Justify the best remaining choice before checking the answer.