Why do your biceps bulge?

Why do your biceps bulge?

Lesson narration:
Scroll for prep
Full Screen
Controls Icon Exit Full Screen

DISCUSS:

What do you think is going on inside your hands when you’re moving your fingers? Any ideas?

Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen

DISCUSS:

Take a few moments to move the different parts of your body, and see if you can find all your joints.

Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen

DISCUSS:

What do you think would actually be pulling on the strings?

Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen

DISCUSS:

Describe how you might go about creating a robot hand that works just like yours.

Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Make a Robot Hand

To make a robot hand, get a piece of thin cardboard (about 6"x8" — a recycled cereal box works well) and Robot Hand Template.

Glue the template to the cardboard and cut on the dotted lines. Then watch the video on the next slide to see how to put it all together.

After students experiment with the robot hand, we suggest a class discussion.

Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Discussion & Video

The robot hand can't do everything your hand can do.

Ask your student to experiment and figure out what their fingers and hands can do that the robot fingers and hands can't. Ask them: If you wanted to make the robot hand more like your hand, what would you need to add to the robot hand?

Discuss this question as a class. After your discussion, watch the video on the next slide to hear some of the differences the Mystery Science team noticed.

Full Screen
Controls Icon Exit Full Screen
Full Screen
Controls Icon Exit Full Screen
Slide Image
Full Screen
Controls Icon Exit Full Screen
Slide Image

skeleton


1 of 12

all of the bones of an animal, including humans
Full Screen
Controls Icon Exit Full Screen
Slide Image

bones


2 of 12

the hard parts inside many animals that help give their bodies shape
Full Screen
Controls Icon Exit Full Screen

joint


3 of 12

a part of the body where two bones come together and can bend
Full Screen
Controls Icon Exit Full Screen

muscle


4 of 12

a part of the body that attaches to bones and allows the body to move
Full Screen
Controls Icon Exit Full Screen
Slide Image

bicep


5 of 12

a large muscle in the upper arm
Full Screen
Controls Icon Exit Full Screen

tendon


6 of 12

a part of the body that attaches muscle to bone
Full Screen
Controls Icon Exit Full Screen

function


7 of 12

what something does
Full Screen
Controls Icon Exit Full Screen

system


8 of 12

a group of things that affect each other and function as a whole
Full Screen
Controls Icon Exit Full Screen
Slide Image

structure


9 of 12

the specific form and shape of something
Full Screen
Controls Icon Exit Full Screen
Slide Image

dissect


10 of 12

to take something apart to study it
Full Screen
Controls Icon Exit Full Screen
Slide Image

model


11 of 12

a pretend version of something that scientists use when the real thing is too big, small, or complicated to work with
Full Screen
Controls Icon Exit Full Screen
Slide Image

observe


12 of 12

to pay close attention to something
Full Screen
Controls Icon Exit Full Screen

Image & Video Credits

Mystery Science respects the intellectual property rights of the owners of visual assets. We make every effort to use images and videos under appropriate licenses from the owner or by reaching out to the owner to get explicit permission. If you are the owner of a visual and believe we are using it without permission, please contact us—we will reply promptly and make things right.

Exploration
futuristic Android by Humanrobo , used under CC BY-SA
orange robot by Alexander Kozusev , used under CC BY
roomba stuck in chair by Geekzine Mexico , used under CC BY-SA
Atlas complex futuristic robot by Defense Advanced Research Projects Agency
DARPA falling over by blue hippo films
Atlas robot by Boston Dynamics
firefighter and rescued child by SanchaiRat
girl lunging by axelle b
baby steps by Berenice Garcia , used under CC BY-SA
man running up hill by Alisha Vargas , used under CC BY-SA
Toronto Blue Jays starting pitcher Ricky Romero by Keith Allison , used under CC BY-SA
Portola Palace Stairs by Bernt Rostad , used under CC BY-SA
child riding a bike by Jerry , used under CC BY-SA
Sydney Gonzalez Gymnast by Ruben Gonzales
white android by Hairygael , used under CC BY-SA
duracell batteries by Anton Fomkin , used under CC BY-SA
sandwich by Seph Swain , used under CC BY-SA
Integrated Circuit by Tomasz Mikołajczyk
brain by Sanandros , used under CC BY-SA
brain and nerves by KRITRIM VAULT , used under CC BY
human hand by Johnny Magnusson
robot hand by Peter Ohlmus
human hand bones by OpenStax College
human skeleton by Scott Anselmo , used under CC BY-SA
seattle building by Seattle Municipal Archives
building skeleton by Les Chatfield , used under CC BY-SA
hand x-ray by Noah Weiss
arduino hand robot by Peter Ohlmus
fried chicken by Evan-Amos
white hen by Agricultural Research Service
white king salmon fillet by Isaac Wedin , used under CC BY-SA
Strip Steak by Ɱ , used under CC BY-SA
Activity
rock em sock em by DJ , used under CC BY-SA
Other
Unit: Bicep by daniel64
Lesson narration:

Activity Prep

Print Prep

In this lesson, students discover the mechanism by which their muscles control their bones to move their bodies. In the activity, Robot Finger, students construct a model of a human finger and observe how pulling on a string (a model for tendons) causes it to bend at the joints.

Preview activity

Exploration

25 mins

Extend this lesson

Download this Lesson to your device so you can play it offline: