Skeleton Squad Slides Grade 2 Science • Mighty Movers Unit
Lesson 1 of 3
Skeleton Squad
Discover how 206 strong bones build our body's frame and how muscles pull to make us go!
Mission 1
Organ Shields
Mission 2
Body Framework
Mission 3
Muscle Motors
What Do Bones Do? The Body Frame
Support & Shape
Think About It!
Without Bones, We Would Be Jellyfish!
Just like the wooden frame holds up a house, your skeleton holds you tall and gives your body its shape.
Bones are hard, light, and alive — they grow as you grow!
Standing Tall
Your spine (backbone) lets you twist, bend, and stand proudly upright.
206 Teammates
Adults have 206 bones working together every single second of the day.
Quick Touch: Gently tap your kneecap and elbow. Feel how solid they are? Super Strong!
Bone Armor: Protecting Delicate Organs
Safety Shields
The Skull
Brain Helmet
A rounded dome made of fused bones that protects your brain from bumps.
Shields: Brain & Sensory Organs
The Ribcage
Heart & Lung Cage
Curved bone bars wrap around your chest to guard your beating heart and breathing lungs.
Shields: Heart & Lungs
The Spine
Nerve Highway
Stack of small ring bones that shields your spinal cord so messages reach your body.
Shields: Spinal Cord Cable
Bones act like built-in armor helmets and cages inside you!
How Muscles Move Us: The Big Secret!
Muscles PULL!
Golden Rule of Muscles
Muscles Only Pull.
They Never Push!
Muscles are attached to bones by stretchy cords called tendons . When a muscle gets tighter and shorter, it pulls on the bone like a tug-of-war rope!
1
Contract (Tighten)
The muscle bunches up, gets thicker, and pulls the bone upward.
2
Relax (Loosen)
The muscle softens and gets longer so another muscle can pull back.
3
Over 600 Muscles
You use 43 muscles just to frown, and 17 muscles to smile!
Try it: Bend your arm and feel your bicep bunch up like a little mountain! That is contraction!
Squad Check: What Did We Learn?
Turn & Talk
Question 1
Why do humans need bones to stand?
What would happen if your skeleton vanished right now?
Hint: Think of a tent without poles!
Question 2
Which bone protects your beating heart?
Why are those bones shaped like curved bars?
Hint: Touch your chest gently!
Question 3
Do muscles push or pull on bones?
Show your partner how a muscle tightens when it pulls.
Hint: Remember the golden rule!
Next Up: Get your Bone Lab Worksheets ready!
Bone Lab Worksheet Mighty Movers • Grade 2 Lesson 1: Skeleton Squad
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Bone Lab Worksheet
Discover your internal frame and organ armor!
Name:
Date:
1
Bone Armor Match-Up
Draw a straight line from each bone armor part to the vital organ or job it protects.
Bone Armor
A. The Skull
B. The Ribcage
C. The Spine (Backbone)
D. Leg Bones (Femur)
Protected Job / Organ
Supports body weight for walking and running
Shields the delicate brain like a helmet
Protects the spinal cord & helps you bend
Curves around the beating heart and lungs
2
Armor Inventor Challenge
Pick one sports helmet, knee pad, or chest guard. In the box below, draw the sports gear and write which bone inside your body inspired it!
This gear protects the: just like the:
★
Fascinating Bone Fact: Babies are born with about 300 soft bones! As you grow, some join together until you have exactly 206 bones .
Mighty Movers • Grade 2 Lesson 1: Skeleton Squad
Page 2 of 2
Muscle Motors Lab
Discover the power of muscle contraction!
Name:
Date:
3
The Arm Flex Investigation
Follow the two steps with your partner. Then circle the word in bold that makes each sentence TRUE.
Step 1: Arm Straight Out
Rest your forearm flat on the desk. Touch the front of your upper arm (your bicep).
The bicep muscle feels:
Step 2: Bend and Flex Up!
Bend your elbow and bring your hand toward your shoulder. Squeeze your fist!
The bicep muscle feels:
4
The Golden Rule of Muscles
A. How do muscles move bones?
Muscles PUSH bones outward
Muscles PULL on bones
B. What happens to a muscle when it contracts?
It gets shorter and thicker
It gets longer and thinner
5
My Mighty Body Blueprint
Fill in each blank using words from the Squad Word Bank.
[ bones ] • [ organs ] • [ 206 ] • [ pull ]
1. My body has a skeleton made of exactly hard bones.
Skeleton Squad Teacher Guide Teacher Guide Mighty Movers • Grade 2 Science
Lesson 1: Skeleton Squad
Instructional Overview & Lesson Pacing
Core Concepts: 206 bones, rigid framework, organ shielding, and muscular pull contraction.
Learning Objectives
Identify the human skeleton as a strong structural framework that supports upright posture.
Explain how specific bones (skull, ribcage, spine) guard vital soft organs.
Demonstrate that muscles cause movement by pulling on bones, never pushing.
Standards & Success Criteria
NGSS Alignment: 2-LS4-1 & Structure/Function crosscutting concept.
Success Criterion: Students can name at least two protective bones and demonstrate muscle contraction on their own arm.
Recommended 45-Minute Instructional Pacing
Phase Time Teacher & Student Actions
Engage 8 min Display Slide 1 & 2. Ask: "What would happen if your skeleton vanished?" Introduce the 206 bone framework with the jellyfish comparison.
Explore 12 min Display Slide 3. Students gently feel their skull, ribs, and backbones. Distribute Page 1 of Bone Lab Worksheet for matching and armor design.
Explain 10 min Slide 4: Muscle motors. Teach the "Golden Rule" (muscles only pull). Model the rubber band stretch and arm bicep flex test.
Elaborate 10 min Pairs complete Worksheet Page 2 (Arm Flex Investigation & Body Blueprint summary). Teacher circulates to check tactile engagement.
Evaluate 5 min Slide 5: Squad Check turn-and-talk questions and collect exit blueprints.
Materials & Hands-on Prep
• Kinesthetic Demonstrations:
Provide thick rubber bands (1 per pair) to simulate muscles pulling on craft sticks (simulated bones).
• Visual Model Support:
A plastic skeleton model or skull diagram helps students see fused cranial bones and flexible intervertebral discs.
Teacher Guide Mighty Movers • Grade 2 Science
Lesson 1: Skeleton Squad
Facilitation Notes & Worksheet Answer Key
Discussion prompts, common misunderstandings, and complete verification key.
Common 2nd Grade Misconceptions
Misconception: "Muscles push your bones open when you straighten your arm."
Correction: Muscles NEVER push. When you straighten your arm, a different muscle in the back of your arm (the triceps) pulls it open!
Misconception: "Bones are dry, dead white rocks inside us."
Correction: Bones are living tissue! They have blood vessels, nerves, and bone marrow producing blood cells, and they grow as children grow.
Dynamic Duos Slides Grade 2 Science • Mighty Movers Unit
Lesson 2 of 3
Dynamic Duos
Bones and muscles can't move alone! Discover how joints connect them and muscle pairs pull together to make every move smooth.
Secret 1
Meet the Joints
Secret 2
Hinges & Sockets
Secret 3
Muscle Tag-Teams
What is a Joint? Where Bones Meet!
Connection Points
Bending Places
Imagine If Your Leg Was One Long Solid Bone...
You couldn't sit in a chair, walk up stairs, or ride a bicycle! A joint is the exact place where two or more bones meet so your body can bend.
Bones are hard, but joints give you flexibility!
Cushion Cartilage
Slippery cartilage caps each bone end so bones glide without grinding.
Strong Ligaments
Tough straps connect bone-to-bone like super-strong rubber bands.
Tiny Joints Everywhere
Your hand alone has over 25 joints so you can grip pencils and wave!
Wiggle your fingers: You are watching dozens of joints work right now! Super Smooth!
Two Main Joint Types in Your Body
Hinge vs Ball-and-Socket
Opens & Closes
The Hinge Joint
Works just like a door hinge! Moves back and forth in one direction .
Where is it in your body?
• Elbows: bending your arm up & down
• Knees: bending your leg to run or jump
Try it: Open and close your elbow like a classroom door!
All Directions
The Ball-and-Socket
A round bone ball fits into a bowl socket! Can rotate and swing in circles .
Where is it in your body?
• Shoulders: windmill swimming arm circles
• Hips: kicking legs forward, back & sideways
Try it: Spin your arm in a big circle like a windmill!
Hinges swing back and forth. Ball-and-sockets swivel all around! Two Super Designs!
Muscle Tag-Teams: The Biceps & Triceps Duo
Teamwork in Action
Move 1: Bending Arm Up
Bicep Pulls! Tricep Relaxes!
The front muscle (bicep ) tightens and pulls the forearm bone UP toward your chest. The back muscle relaxes.
Movement Mystery Activity Mighty Movers • Grade 2 Lesson 2: Dynamic Duos
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Movement Mystery Activity
Test your joints and discover how your body bends and spins!
Name:
Date:
1
Joint Testing Lab
Stand up safely with your partner. Move each joint listed below, then circle its motion type and joint name.
Body Joint How did it move? Joint Mystery Type Does it spin circles?
1. Elbow
Bend arm to touch shoulder
[ Opens & Closes ]
[ Hinge ]
[ YES / NO ]
2. Shoulder
Windmill arm like swimming
[ Opens & Closes ]
[ Hinge ]
[ YES / NO ]
3. Knee
Kick foot back & straighten
[ Opens & Closes ]
[ Hinge ]
[ YES / NO ]
4. Hip
Circle leg while holding chair
[ Opens & Closes ]
[ Hinge ]
[ YES / NO ]
2
The Cartilage Cushion Check
Cartilage is a smooth, rubbery pillow between bones. Read the clues and circle True or False.
Statement A: Cartilage keeps hard bones from rubbing painfully against each other.
[ TRUE ] [ FALSE ]
Statement B: You have cartilage at the tip of your nose and your ears.
[ TRUE ] [ FALSE ]
🔍
Detective Clue: If a joint moves in only one direction like a classroom door, it's a hinge ! If it can make circles, it's a ball-and-socket !
Mighty Movers • Grade 2 Lesson 2: Dynamic Duos
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Muscle Tag-Team Challenge
See how muscle pairs coordinate everyday actions!
Name:
Date:
3
The Tag-Team Bicep & Tricep Check
Hold an eraser or pencil. Test both motions below, then complete the sentences.
Action 1: Lifting Pencil to Chin
The bicep in the front of your arm tightens and pulls the forearm up.
Bicep is: CONTRACTING
Dynamic Duos Teacher Guide Teacher Guide Mighty Movers • Grade 2 Science
Lesson 2: Dynamic Duos
Instructional Overview & Station Setup
Core Concepts: Joints as pivot points, hinge vs. ball-and-socket motion, and agonist/antagonist muscle pairs.
Learning Objectives
Define a joint as the place where two or more bones meet.
Contrast hinge joints (back-and-forth) with ball-and-socket joints (circular rotation).
Explain why muscles must work in opposing pairs (biceps & triceps) to bend and extend limbs.
Standards & Success Criteria
NGSS Alignment: 2-PS1-2, 2-LS4-1 & Systems and System Models.
Success Criterion: Students accurately classify elbow and shoulder movements and describe the flex/relax cycle of arm muscles.
Recommended 45-Minute Instructional Pacing
Phase Time Teacher & Student Actions
Engage 7 min Slide 1 & 2: "Robot Walk Challenge" — have students try walking with completely stiff knees and elbows. Discuss what is missing (joints!).
Explore 13 min Slide 3: Introduce hinge vs ball-and-socket. Distribute Page 1 of Movement Mystery Activity. Students test elbows, knees, hips, and shoulders in pairs.
Explain 10 min Slide 4: Muscle Tag-Teams. Teach biceps/triceps partner roles. Connect to "muscles only pull" from Lesson 1.
Elaborate 10 min Students complete Page 2 (Everyday Action Breakdown & Scientist Reflection). Slide 5 analyzes a soccer kick or jump rope.
Evaluate 5 min Quick-fire teacher check: "Point to a hinge!" "Point to a ball-and-socket!" Review reflection responses.
Hands-on Model Station Prep (Zero Prep Cost)
• Hinge Model Demo:
Two cardboard strips pinned together with a metal paper fastener (brad) show back-and-forth 180° swing.
• Ball-and-Socket Model Demo:
A golf ball / foil ball sitting inside a small paper cup demonstrates 360° circular rotation.
Teacher Guide Mighty Movers • Grade 2 Science
Lesson 2: Dynamic Duos
Facilitation Notes & Worksheet Answer Key
Teacher prompts, misconceptions, answers, and accessibility supports.
Common 2nd Grade Misconceptions
Misconception: "The elbow can circle around just like the shoulder."
Correction: What looks like an elbow circle is actually the shoulder rotating the entire arm! If you hold your upper arm locked still, your elbow can only swing open and shut.
Misconception: "One single muscle bends and straightens my arm."
Correction: Because muscles can only pull, you need one muscle to pull it shut (bicep) and a second muscle on the opposite side to pull it open (tricep).
Body Boosters Slides Grade 2 Science • Mighty Movers Unit
Lesson 3 of 3
Body Boosters
Your bones and muscles take care of you every day. Learn the superhero habits to feed, protect, and recharge them!
Booster 1
Calcium & Sun
Booster 2
Active Play
Booster 3
Armor & Sleep
Fueling Bones: The Calcium & Sunshine Team
Bone Strength
Mineral Power
Calcium Makes Bones Hard Like Concrete
Every glass of milk, cup of yogurt, piece of cheese, or bowl of broccoli gives your bones the calcium blocks they need to stay rock solid!
Sunlight gives you Vitamin D so your body can absorb calcium!
Dairy & Plant Milks
Milk, cheese, yogurt, and calcium-fortified soy or oat drinks.
Crunchy Green Veggies
Broccoli, spinach, and kale pack hidden calcium for strong bones.
Outdoor Sunshine
15 minutes of outdoor recess sparks your body's Vitamin D factory!
Bones store 99% of your body's calcium. Keep them filled up! Bone Bank!
Muscle Builders: Protein, Water & Play
Muscle Power
Protein Power
Eggs, beans, nuts, chicken, and tofu contain protein bricks that repair and build muscle fibers.
Water Hydration
Muscles are 75% water! Drinking plenty of water stops painful muscle cramps and keeps joints gliding.
60 Minutes of Play
Jumping rope, running tag, and climbing trees tell your bones and muscles to grow bigger and denser!
Use it or lose it! Active play makes both bones and muscles stronger. Move Every Day!
Protecting the Machine: Armor & Posture
Safety First
External Armor
Your bones are strong, but hard concrete is stronger! Always wear your helmet when biking, scootering, or skating.
• Helmets: Protect the skull & brainKnee & Wrist Pads: Protect delicate joints
Mighty Posture
Slouching bends your spine unnaturally and strains back muscles. Sitting tall stacks your vertebrae like neat building blocks!
• Shoulders rolled back and relaxed
Quick Check: Sit tall right now, roll your shoulders back, and take a deep breath! Feels Great!
The Recharge Station: Sleep & Recovery
Rest & Grow
What Happens When You Sleep?
Body Booster Challenge Mighty Movers • Grade 2 Lesson 3: Body Boosters
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Body Booster Challenge
Feed, protect, and power your bones and muscles!
Name:
Date:
1
Bone & Muscle Fuel Sorter
Circle whether each item is a BOOSTER for bones & muscles, or a HARMER if consumed often.
1. Fresh Milk or Soy Milk
Full of calcium & vitamin D
[ BOOSTER / HARMER ]
2. Sugary Fizzy Soda
Lots of acid & sugar, zero calcium
[ BOOSTER / HARMER ]
3. Steamed Broccoli Trees
Green mineral-rich veggie
[ BOOSTER / HARMER ]
4. Hard Boiled Egg or Beans
Packed with muscle-building protein
[ BOOSTER / HARMER ]
5. Tall Glass of Cold Water
Hydrates muscles & cushions joints
[ BOOSTER / HARMER ]
6. Bag of Sour Gummy Worms
Pure sugar, no body-building fuel
[ BOOSTER / HARMER ]
2
My Mighty Superhero Power Plate
Draw and label a delicious snack that includes at least one Bone Booster and one Muscle Builder .
My Bone Booster is: My Muscle Builder is:
💪
Fuel Fact: When you run and jump outside, sunshine gives you Vitamin D while exercise signals bones to store extra calcium!
Mighty Movers • Grade 2 Lesson 3: Body Boosters
Page 2 of 2
Posture Check & Superhero Pledge
Commit to healthy daily habits for lifelong strength!
Name:
Date:
3
The 4-Point Mighty Posture Audit
Check off each posture checkpoint as your partner watches you sit tall!
1. Feet Flat on Floor
Supports lower leg bones & balance
2. Spine Straight & Tall
Stacks backbones like solid blocks
3. Shoulders Rolled Back
Opens chest for healthy lungs
4. Chin Level & Eyes Forward
Stops neck muscles from straining
4
Safety Gear Match
1. When riding my bicycle or scooter, I wear a to guard my skull.
2. When roller skating or skateboarding, I wear knee and wrist to protect my joints.
3. Every night, my growing body needs hours of sleep to repair my muscles.
Body Boosters Teacher Guide Teacher Guide Mighty Movers • Grade 2 Science
Lesson 3: Body Boosters
Instructional Overview & Unit Capstone
Core Concepts: Calcium/vitamin D mineralization, weight-bearing exercise, ergonomics/posture, and restorative sleep.
Learning Objectives
Classify foods and activities that nourish bones (calcium/vitamin D) and muscles (protein/water).
Evaluate everyday habits: posture, protective safety gear, and 9-11 hours of sleep.
Create a personal 7-Day Mighty Superhero Pledge committing to healthy movement.
Standards & Success Criteria
Health & NGSS Alignment: National Health Standards 1 & 7, 2-LS4-1.
Success Criterion: Students identify bone boosters vs. harmers and demonstrate the 4-point posture check.
Recommended 45-Minute Instructional Pacing
Phase Time Teacher & Student Actions
Engage 8 min Display Slide 1 & 2. Ask: "What did you feed your skeleton today?" Contrast calcium-rich foods with sugary empty drinks.
Explore 12 min Slide 3 & 4. Conduct the 3-Minute Kinetic Reset (below). Distribute Body Booster Challenge Page 1 (Fuel Sorter & Power Plate).
Explain 10 min Slide 4 & 5: Armor, posture blocks, and sleep hormone recharge. Connect nighttime sleep to muscle fiber repair.
Elaborate 10 min Page 2: Partner Posture Audit and signing of the 7-Day Mighty Superhero Pledge with peer witness.
Evaluate 5 min Celebrate badge completion! Quick sequence recap linking bones, joints, muscles, and boosters.
Active Brain Break: The Mighty Mover 3-Minute Kinetic Reset
1. Hinge Squats (30s)
Bend knees and hips to squat like sitting in a chair; feel leg muscles work.
2. Windmills (30s)
Spin shoulder ball-and-socket joints in slow, controlled backward circles.
3. Posture Freeze (30s)
Stand tall like a mountain, shoulders relaxed, taking three deep breaths.
Teacher Guide Mighty Movers • Grade 2 Science
Lesson 3: Body Boosters
Unit Assessment Rubric & Answer Key
3-part unit proficiency rubric, challenge answer key, and home connection tips.
Mighty Movers Unit Assessment Rubric (Grade 2)
Target Area Approaching (1 pt) Proficient (2 pts) Exemplary (3 pts)
1. Explain Jobs Identifies that bones or muscles exist but confuses push/pull. Explains that bones support/protect and muscles pull to move. Accurately links specific bone armor to organs & describes contraction.
2. Connect Movement Cannot distinguish joint types or muscle pairs. Distinguishes hinge vs ball-and-socket; recognizes muscle pairs. Breaks down multi-step motions (kicking, waving) across joints and pairs.
