Muscular System Activity: 8 Hands-On Stations for Teaching Skeletal, Smooth, and Cardiac Muscle (TEKS 7.13A)

Chris Kesler · 8 min read

Tell a 7th grader to stop blinking. They can do it for about 15 seconds before their eyes burn and water and the blink fires anyway. Tell them to hold their breath. They can override that one too, but only for so long. Then tell them to stop their heart from beating using just their willpower. They can't. That's the difference between voluntary and involuntary muscle, and it lands in 30 seconds without a single slide.

The Muscular System is the system kids think of as biceps and quads. They flex, they lift, they show off. But ask them what's pumping their blood, what's pushing food through their stomach, what's keeping them upright when they're slouching at their desk, and they don't connect any of it to muscle. They don't know there are three different kinds of muscle, that two of them work without the brain even sending an instruction, and that one of them only exists in one organ in the entire body.

The Muscular System Functions Station Lab for TEKS 7.13A closes that gap in one to two class periods. Kids run a hands-on test of voluntary and involuntary muscle (no-blink staring, intentional blinking, automatic breathing, controlled breathing), study three bar graphs showing how oxygen levels, blood flow, and muscle temperature change during intense exercise, and learn the structure and job of skeletal, smooth, and cardiac muscle. By the end, they can name three muscle types, give an example of each, and explain why your heart never stops working but your bicep gets tired after one set of curls.

⏱ 1–2 class periods 📓 7th Grade Science 🧪 TEKS 7.13A 🎯 Built-in differentiation 💻 Print or Digital

8 hands-on stations for teaching the muscular system

A station lab is a student-led activity where small groups rotate through 8 stations (plus a 9th challenge station for early finishers) at their own pace during one to two class periods. You become a facilitator instead of a lecturer. You walk around, spot-check the breathing and blinking timing, and break misconceptions while kids work through the rotation.

The Muscular System Functions Station Lab has four input stations (where students take in new info on voluntary vs involuntary muscle, the three types of muscle tissue, and how muscle responds during intense exercise) and four output stations (where they show what they learned). Here's what's at each one.

📷 Image slot 1 — add screenshot

📷 Image slot 2 — add screenshot

4 input stations: how students learn the muscular system

🎬 Watch It! —

A short YouTube video walks students through the muscular system. Three questions follow: what are some everyday activities that involve the muscular system, name the three types of muscles and describe where each is found in the body, and how does the muscular system help regulate body temperature. Visual learners come alive at this station before they ever try to stop blinking.

📖 Read It! —

A one-page passage called "I Like to Move It, Move It!" introduces the muscular system as a powerhouse that handles movement, posture, joint stability, and heat generation. Students learn the three muscle types: skeletal (voluntary, attached to bones, biceps and triceps work in pairs), smooth (involuntary, in the stomach and intestines), and cardiac (involuntary, only in the heart). Three multiple-choice questions follow plus five vocabulary words to define: voluntary, involuntary, skeletal muscle, smooth muscle, cardiac muscle. Comes in two reading levels (Dependent and Modified) plus a Spanish version.

🔬 Explore It! —

This is the heart of the lab. Students run four short body experiments to feel the difference between voluntary and involuntary muscle. Test 1 (no-blink stare): stare at a dot for 30 seconds without blinking. The blink reflex fights back, hard. Test 2 (deliberate blinking): count how many times they can blink on purpose in one minute. Test 3 (automatic breathing): place a hand on the chest and sit still for 30 seconds, noticing the chest rise and fall on its own. Test 4 (controlled breathing): take 30 deep, controlled breaths counting each one. Six reflection questions tie the four tests to the voluntary-involuntary distinction and ask why breathing being mostly involuntary is a survival advantage.

💻 Research It! —

Students examine 8 reference cards: an Oxygen Levels in Muscles bar graph (resting 98%, moderate 95%, intense 92%, recovery 96%), a Blood Flow to Muscles bar graph (resting 2.7, moderate 5, intense 9.7, recovery 4.1 L/m²/min), a Muscle Temperature bar graph (resting 37°C, moderate 39°C, intense 41°C, recovery 38°C), and three text cards explaining muscle functions, oxygen's role in muscle contraction, and how blood flow delivers oxygen and removes waste. Three questions check whether they can describe what happens to oxygen, temperature, and blood flow during intense exercise, compare oxygen levels at rest and during intense exercise, and explain why blood flow during intense exercise matters even though oxygen levels are lower.

📷 Featured station deep-dive — add screenshot of the Explore It! task card

4 output stations: how students show what they learned

📋 Organize It! —

A three-column card sort. Kids match each muscle type (smooth, skeletal, cardiac) with four cards: voluntary or involuntary, where it's found in the body, what it does, and a microscope-level example image. "Found in the walls of internal organs such as the stomach, intestines, and blood vessels" → smooth. "This is a specialized muscle found only in the heart" → cardiac. "Helps move bones, maintain posture, and support the body" → skeletal. Easy to spot-check at a glance.

🎨 Illustrate It! —

Students draw two sketches: one example of an involuntary muscle movement (heartbeat, digestion, blood vessel constriction) and one example of a voluntary muscle movement (running, smiling, throwing a ball). They use colored pencils to add labels and detail. Even kids who say "I can't draw" surprise themselves here. The two side-by-side drawings lock in the voluntary-involuntary distinction better than any worksheet.

✍️ Write It! —

Three open-ended questions: explain the structures of the muscular system, what are the main functions of the muscular system, and how do voluntary and involuntary muscle movements work together to help you perform complex tasks like playing a musical instrument or participating in a sport. The third question is the killer. It forces kids to chain skeletal muscle (you control your fingers on the piano keys) with cardiac muscle (your heart speeds up because you're focused) and smooth muscle (your stomach digests breakfast while you play) into one cohesive answer.

📝 Assess It! —

Three multiple-choice questions plus a fill-in-the-paragraph that uses all five Read It! vocabulary words (voluntary, involuntary, skeletal muscle, smooth muscle, cardiac muscle). The paragraph reads: "___ actions like running and smiling are controlled by ___ muscles, which you can control. ___ movements, such as the pumping of blood by ___ muscle and the digestion of food by ___ muscle..." If you're grading the lab, this is the easiest station to grade.

Bonus Challenge It! station for early finishers

🏆 Challenge It! —

Four optional extensions: create flashcards for at least 10 vocabulary terms from the unit and quiz a partner, build a crossword puzzle using at least 7 muscular-system terms with descriptive clues, design a chart that shows how the muscular system relates to at least 3 other body systems with a description, example, and sketch for each, or write a story about a kid superhero who uses all three types of muscle (voluntary and involuntary) to fight crime. Requires teacher approval before they start.

How this fits into a complete muscular system unit

This Station Lab is the Explore day of our full Muscular System Functions Complete 5E Lesson for TEKS 7.13A. The complete two-week unit follows the 5E method of instruction and includes an Engage hook, the Muscular System Station Lab for Explore, PowerPoint slides and interactive notebook pages for Explain, student choice projects to Elaborate, and an Evaluate assessment.

Most teachers grab the full 5E because the Station Lab lands hardest with the days around it. But if you just need a strong hands-on day on the muscular system, the Station Lab on its own does the job.

Two options

Full 5E Lesson $13.20 Get the 5E Lesson

Just the Station Lab $7.20 Get the Station Lab

Materials needed to teach the muscular system

Materials beyond what's in the download:

A stopwatch or phone timer — at least one per group for the 30-second blinking and breathing tests. A wall clock with a second hand also works.
Index cards for the Challenge It! flashcard and crossword extensions.
Colored pencils or markers for the Illustrate It! station and the Challenge It! superhero story.
Pencils and the printed answer sheets (included)
A device with internet for the Watch It! station and the optional Challenge It! crossword maker
Optional: a small mirror per group so kids can watch their own eyes when they try to stop blinking

Standard covered: Texas TEKS 7.13A —

Investigate and explain the functions of the circulatory, respiratory, digestive, urinary, immune, integumentary, nervous, muscular, skeletal, reproductive, and endocrine systems. Supporting Standard.

See the full standard breakdown →

Grade level: 7th grade life science

Time: One to two class periods (45–110 minutes total). Plan for two periods the first time you run a station lab.

Common student misconceptions this lab fixes

"There's only one kind of muscle in the body."
Kids picture muscle as the bicep and stop there. The Read It! passage corrects this directly: there are three types: skeletal, smooth, and cardiac. The Organize It! card sort makes it physical. Kids match each muscle type to where it lives, what it does, and what it looks like under a microscope. Cardiac muscle exists in exactly one organ (the heart). Smooth muscle is in the stomach, intestines, and blood vessels. Skeletal is what they see in the mirror. Three different jobs. Three different structures. Same body.
"You can control all your muscles if you concentrate hard enough."
Kids assume the brain runs the show, period. The Explore It! station breaks this in 60 seconds. Test 1: try to not blink for 30 seconds. The blink wins. The eye muscle has an automatic override. Test 3: sit still and feel your chest rise. You didn't tell it to. The Read It! passage names the cause: smooth and cardiac muscle are involuntary. They work whether you're paying attention or not. Cardiac muscle has zero voluntary control at all. The lesson lands as: the brain doesn't run everything. Some muscles are smarter than that.
"When you're tired during exercise, it's because your muscles ran out of oxygen."
Kids hear "oxygen drops during exercise" and conclude the muscle is starved. The Research It! graphs tell a more complete story. Oxygen levels do drop (from 98% to 92% during intense exercise) but blood flow increases dramatically (from 2.7 to 9.7 L/m²/min). The body is delivering more oxygen than ever, but the muscles are using it faster than it arrives. Plus the muscle is heating up (from 37°C to 41°C) which is why you feel hot. The third Research It! question pushes them to think: if oxygen is dropping, why is the body bothering with all that extra blood flow? Because without the extra delivery, the drop would be far worse, and the muscle would actually fail.

What you get with this muscular system activity

📷 Inside-the-product — add screenshot of Read It passage or sample answer sheet

When you buy the Station Lab, you get a single download with everything you need:

Print version at two reading levels (Dependent for on-grade, Modified for additional support) plus a Spanish Read It! passage
Digital version as PowerPoint files (works in Google Slides too) at both levels — for 1:1 classrooms or Google Classroom
Teacher Directions and Answer Key for both versions, all keys included
Station task cards ready to print, laminate, and drop in baskets at each station
Reference cards for the Research It! station (Oxygen Levels in Muscles bar graph, Blood Flow to Muscles bar graph, Muscle Temperature bar graph, three text cards on muscle functions and exercise response)
Sort cards for the Organize It! station (12 cards plus 3 microscope-image cards split across smooth, skeletal, and cardiac)
Student answer sheets for each level

No login required. Download once, use forever. Reprint as many times as you want.

Tips for teaching the muscular system in your 7th grade classroom

Two things make this lab go smoother the first time:

1. Demo the no-blink stare yourself before kids try it.

At the start of class, before the rotation opens, tell kids you're going to stare at the back wall for as long as you can without blinking. Have someone time you on a phone. You'll start tearing up around 20 seconds and your blink reflex will fire by 25-30. The dramatic moment when your eye refuses to listen is exactly the lesson you want them to take to the Explore It! station. Plus it's funny, which makes kids actually pay attention to the science.

2. Have students take their resting pulse, then walk in place for 30 seconds and take it again.

Before the lab, walk kids through finding their pulse on the wrist or neck and counting beats for 15 seconds (then multiply by 4). Have them write the resting number on the board. After cleanup, have them walk in place for 30 seconds and take their pulse again. The pulse jumps, sometimes by 30-40 beats per minute. That's the cardiac muscle responding to the call for more oxygen, exactly like the Research It! Blood Flow graph predicts. It's a 90-second formative assessment that ties the abstract bar graphs to a number kids felt in their own neck.

Get this muscular system activity

Muscular System Functions Station Lab for 7th grade life science — TEKS 7.13A

Buy the Station Lab — $7.20

Or if you want the full two-week experience with the Engage hook, Explain day, Elaborate extension, and Evaluate assessment all included:

Buy the full 5E Complete Lesson — $13.20

(Station Lab is included)

Frequently asked questions

What does TEKS 7.13A cover?

Texas TEKS 7.13A asks 7th grade students to investigate and explain the functions of all the major body systems, including the muscular system. By the end, students should be able to name the three types of muscle (skeletal, smooth, cardiac), distinguish voluntary from involuntary movement, give examples of each, and describe how the muscular system supports movement, posture, joint stability, and heat generation. This Station Lab focuses specifically on the muscular system. The other body systems (circulatory, respiratory, digestive, urinary, immune, integumentary, nervous, skeletal, reproductive, endocrine) each have their own dedicated Station Lab.

What's the difference between skeletal, smooth, and cardiac muscle?

Skeletal muscle is voluntary, attached to your bones, and works in pairs (when your bicep contracts, your tricep relaxes) to move your body. Examples: biceps, hamstrings, jaw. Smooth muscle is involuntary and lines the inside of organs like the stomach, intestines, and blood vessels. It moves food through the digestive tract and adjusts blood vessel diameter. Cardiac muscle is also involuntary but it only exists in one place: the heart. It's specialized to contract rhythmically and never get tired. The Organize It! card sort and the Illustrate It! voluntary-vs-involuntary drawings drive these distinctions home.

How long does this muscular system activity take?

One to two class periods (45 to 110 minutes total). The Explore It! station has four short body tests (no-blink, deliberate blinking, automatic breathing, controlled breathing), which is the longest part. Plan for two periods the first time you run a station lab. Once your class has the routine down, most groups can finish all 8 stations in one period.

Do I need to provide my own materials?

A stopwatch or phone timer per group, index cards, colored pencils, and optional small mirrors. Total cost for a class of 30: under $5 if you don't already have these supplies. The Watch It! station also needs a device with internet, and the optional Challenge It! crossword extension uses a device.

Can I use this in a 1:1 digital classroom?

Yes. The full digital version (PowerPoint or Google Slides) works in 1:1 classrooms and Google Classroom. The four Explore It! body tests can be replaced with timed slide activities, or you can keep the Explore It! station as the one physical center kids rotate through.