Inside the Muscular System Functions 5E Lesson
The 5E instructional model walks students through five phases: Engage, Explore, Explain, Elaborate, and Evaluate. It flips the traditional lecture-first sequence on its head. Students explore a concept hands-on before you ever explain it, which means by the time you do explain it, they have something to hook the vocabulary onto.
I switched to the 5E model years ago and stopped going back. Kids retain more, ask better questions, and stop staring at me waiting to be told the answer. The Muscular System Functions 5E Lesson is built on this framework from start to finish. Here's how it plays out across the five phases.
🎯 Engage
Day one is a teacher-led hands-on exploration. Each small group gets a set of "action cards" describing different body movements (running, blinking, digesting food, heart beating, smiling, breathing) and a sorting mat with three columns labeled Skeletal, Smooth, and Cardiac. Following the teacher directions, students work through the stack as a group, sort each action by which type of muscle is doing the work, and then mark whether each one is voluntary or involuntary.
By the end of the period, kids have the sorting mat sketched onto their student sheet and they can explain in their own words why running is voluntary skeletal, why your stomach is involuntary smooth, and why the heart is involuntary cardiac. Nobody has heard a vocabulary lecture yet. That's the point. They're walking into the rest of the unit with a working mental model, not a memorized definition.
What's included in the Engage:
- Teacher directions for the action-card sorting activity
- Printable student observation sheet
- Answer key for the discussion questions
- Four learning objective slides (standard verbatim, "Describe" verb highlighted, "I CAN...", and "WE WILL...")
- An illustrated Body Systems Word Wall in English and Spanish covering the full unit vocabulary
🔬 Explore
The Muscular System Functions Station Lab is the heart of the Explore phase. Students rotate through 8 stations (plus a 9th challenge station for early finishers) over one class period. The Station Lab is split into four input stations (where kids take in new information) and four output stations (where they show what they learned).
The four input stations:
- 🎬 Watch It! — Students watch a short video on the three muscle types and how skeletal muscles attach to bones, and answer guided questions on contraction and relaxation.
- 📖 Read It! — A one-page reading passage at two differentiated levels, with a Spanish version included.
- 🔬 Explore It! — Students build a working arm model out of cardboard, brass fasteners, and rubber bands to demonstrate how the biceps and triceps work as antagonistic pairs around the elbow joint.
- 💻 Research It! — Reference cards on the three muscle types, tendons vs. ligaments, and how the muscular system interacts with the skeletal, circulatory, and nervous systems.
The four output stations:
- 📋 Organize It! — A card sort where students place body actions into the right muscle type and the right control category (voluntary or involuntary).
- 🎨 Illustrate It! — Students draw a labeled diagram of the biceps and triceps in two positions (arm flexed, arm extended) and label which muscle contracts and which relaxes.
- ✍️ Write It! — Three open-ended questions in complete sentences (this is where you see who really gets antagonistic muscle pairs).
- 📝 Assess It! — A short formative check with multiple choice and a fill-in-the-blank vocabulary paragraph.
Print and digital versions are both included. If you want the full breakdown of what happens at every single station, what students produce, and how to set it up, that's in our dedicated Station Lab post.
→ Read the full Muscular System Functions Station Lab walkthrough 8 stations, materials list, teacher tipsThe Station Lab is included in the full 5E lesson. You don't need to buy it separately if you're getting the whole unit.
📚 Explain
Here's the real payoff of doing the Engage and Explore before the Explain: by the time kids hit this phase, they've already sorted body movements by muscle type and built a working arm model with their hands. They have a working understanding before you ever start naming things. The discussions get deeper, the questions get sharper, and you spend less time defining and more time pushing their thinking.
The Muscular System Functions Presentation walks 7th graders through the full scope of TEKS 7.13A for this system, one concept at a time. The deck opens with the big idea: the human muscular system has over 640 muscles, and they're doing a lot more than helping you look strong. The main functions include movement of the body, maintaining posture, stabilizing joints, and generating heat (this last one is why you shiver when you're cold). Then students see the properties that make muscles unique. Muscles are excitable (they respond to nerve signals), contractible (they shorten when stimulated), extensible (they stretch without breaking), and elastic (they bounce back to their original shape). Those four properties are why muscles work the way they do.
From there the deck breaks down the three types of muscle. Skeletal muscles are attached to bones by tendons and move your skeleton. They're voluntary, meaning you choose to use them. They're also striated, which means under a microscope they have a striped pattern. Biceps, triceps, quadriceps, hamstrings are all skeletal. Smooth muscles line the walls of your internal organs (stomach, intestines, blood vessels, bladder). They're involuntary, which means they work without you thinking about them, and they're not striated. Cardiac muscle is found only in the heart. It's striated like skeletal muscle but involuntary like smooth muscle, and it never stops contracting your entire life. Once kids see those three types side by side, the differences click fast.
Then the lesson gets into how muscles actually move bones, which is the meatiest part of the standard. Muscles can only do one thing: pull. They can't push. So at every joint, muscles work in antagonistic pairs. When one contracts, the other relaxes. The classic example is the biceps and triceps at the elbow. When you bend your arm, the biceps contracts and the triceps relaxes. When you straighten your arm, the triceps contracts and the biceps relaxes. The deck includes a built-in animation and a Quick Action INB task where students drag muscle labels to the right position in the contracting/relaxing pair. Once they see that muscles only pull (never push), a lot of confusion clears up.
The deck closes by tying the muscular system back to the other body systems it interacts with. The muscular and skeletal systems work together for movement. The muscular and nervous systems work together because the brain sends signals through nerves to tell muscles to contract. The muscular and circulatory systems work together because muscle cells need oxygen from the blood to release energy, and they produce heat that warms the blood. That cross-system thinking is exactly what TEKS 7.13A is asking for.
What makes the Muscular System Functions Presentation different from a typical body-systems slideshow is that kids are doing something on almost every slide. It's not a lecture deck. It's a participation deck. "Your answer:" prompts appear on most slides, Brain Breaks reset attention every few slides, and Quick Action INB tasks (muscle-type sorting, antagonistic-pair matching, function mapping) show up throughout. Think About It prompts push deeper into bigger ideas like why athletes warm up before a workout and how a frog's leg muscles compare to a human's. The deck closes with a Check for Understanding tied back to the Essential Questions: What is the main function of the muscular system? and How does the muscular system interact with the other body systems?
The Explain materials in this product include:
- An editable Presentation at two differentiated levels (Dependent and Modified), works in PowerPoint or Google Slides
- A guided fill-in-the-blank student notes handout that mirrors the Presentation, with answer key
- A Paper Interactive Notebook (English and Spanish) students cut, fold, and glue into their notebooks
- A Digital Interactive Notebook at both levels with answer keys, for 1:1 classrooms or Google Classroom
The Explain runs across two class periods. The built-in Think About It prompts are where the real discussion happens, so let those breathe.
🛠️ Elaborate
The Elaborate phase is where students stretch what they learned about the muscular system and put it into a project of their choosing. In this 7th grade life science lesson, that's a Student Choice Project board with six different project options plus a "design your own" pathway.
Students might build a 3-D model showing the biceps and triceps working as antagonistic pairs at the elbow, design an infographic of the three muscle types with real-world examples of each, write a day-in-the-life narrative from the point of view of a single skeletal muscle, or record a short video explaining why muscles can only pull (never push) using examples from sports. There are options for kids who love to write, kids who love to draw, kids who love to build, and kids who love to perform. Whatever the project, the point is the same: students apply muscle types, antagonistic pairs, and system interactions to a real-world artifact instead of a worksheet.
Choice is the whole point. By letting students pick how they show their thinking, you get more authentic work for TEKS 7.13A and you actually get to see what they understand about the muscular system.
The rubric (the part teachers actually want)
Every project, no matter which option a student picks, is graded on the same rubric. Five categories at 20 points each:
- Vocabulary (20 pts) — At least four words from the lesson are used in context.
- Concepts (20 pts) — At least two key concepts from the lesson are referenced.
- Presentation (20 pts) — The project grabs attention and is well-organized.
- Clarity (20 pts) — Easy to understand. Free of typos.
- Accuracy (20 pts) — Drawings and models are accurate. The science is right.
The rubric uses a minus / check / plus shorthand on every row so you can grade a stack of projects quickly without re-reading every criterion.
Two differentiated versions in one file
The standard version is for students ready for independent application of muscular system ideas. The Reinforcement version is for students who need additional vocabulary or concept support. Three of the six options are swapped for projects with a tighter vocabulary tie-in, and "design your own" is replaced with "collaborate with the teacher" so kids aren't pitching cold.
✅ Evaluate
The Evaluate phase wraps the unit with a formal assessment. It's not all bubble-in. Several questions show students diagrams of muscle pairs and ask them to identify which is contracting, which is relaxing, and which muscle type is shown.
The full assessment has 12 questions across five formats:
- Multiple choice (4 questions) covering the three muscle types, voluntary vs. involuntary, tendons, and the main functions of the muscular system
- Hotspot / visual (2 questions) where students click the biceps and triceps on a flexed-arm diagram and identify which is contracting
- Multiselect (2 questions) where students pick all of the actions controlled by skeletal muscle, and all of the locations smooth muscle is found
- Short answer (2 questions) on how muscles only pull (never push) and why antagonistic pairs are necessary, and on how the muscular and skeletal systems work together
- Multipart scenario (2 questions) with a real-world example (a student picking up a heavy backpack) where students identify the muscles contracting, the muscle type involved, and the system interaction with the skeletal and nervous systems
A modified version is included for students who need additional support. Fewer multiple-choice distractors and sentence-starter scaffolds on the short-answer items.
If you've taught all five phases, this assessment shouldn't surprise anyone. It's a chance for kids to show you they get it.
How everything fits together
If you want the whole experience (Engage hook, the Station Lab as the Explore, the Explain day with Presentation and interactive notebook, the Student Choice Elaborate, and the Evaluate assessment all in one download), that's the Muscular System Functions Complete 5E Science Lesson.
If you only need the one-day hands-on activity, the Station Lab works as a standalone. Most teachers buy the full 5E because the Station Lab works harder when it's bookended by a strong Engage and a follow-up Explain. But both are honest options.
Get the Muscular System Functions 5E Lesson
Or if you only need the one-day hands-on Station Lab:
(The Station Lab is included in the full 5E Lesson)
Frequently asked questions
Does this cover all of TEKS 7.13A?
For the muscular system, yes. The full standard asks students to describe the function and interactions of all 10 major body systems. This lesson covers the muscular system in depth, including the three muscle types and how it interacts with the skeletal, nervous, and circulatory systems. We have nine more 5E lessons for the other body systems under the same standard.
What do my students need to know before this lesson?
A basic understanding of cells, tissues, and organs from earlier grade-level standards. The skeletal system lesson pairs well as a prerequisite because muscles work directly with bones.
How long does it take to teach?
Done with fidelity, about 10 class periods of 45 minutes each: one day for the Engage, two days for the Station Lab, two days for the Presentation and Interactive Notebook, three days for the Student Choice Project, and one to two days for review and the assessment. A compressed sample plan is included in the file if you need to move faster.
Do I need special supplies?
Just cardboard, brass fasteners (brads), and rubber bands for the Explore It! arm model, plus printed cards for the Engage. Most teachers already have what they need.
Does this work for digital classrooms?
Yes. Every component has a digital version. The Station Lab is fully digital-ready (Google Slides), the Presentation works in Google Slides, and the Student Choice Projects can be submitted as videos, slide decks, or written work.
Is this 5E lesson aligned to NGSS too?
It aligns with MS-LS1-3 (using arguments supported by evidence for how the body is a system of interacting subsystems composed of groups of cells). Built TEKS-first, but the standards overlap.