Myofibril (Tiny Muscle Fiber) Activity
Sarcomere_straw_cleaner_sm.jpg
Sarcomere_straw_cleaner_sm.jpg


Sarcomere.gif
Sarcomere.gif

Sarcomere.gif

In this activity we will make a model of the contracting units of mucles.
*Muscles are made of bundles.
*Each bundle is made up of muscle fibers.
*Each muscle fiber is one muscle cell.
*Muscle cellsl have many nuclei and myofibrils (tiny muscle fibers).
*Each myofibril has many sarcomeres.
*Sarcomeres are what contracts in a muscle.
*Myofibrils have many sarcomere end to end and side by side.
1. Draw a 5 inch by 1 inch box on your paper crosswise. (5 wide and 1 high)
2. Cut both of your straws into 4 equal pieces, making 8 pieces in total.
3.Cut your pipe cleaner into 4 equal pieces.
4. Roll two thin, 1 inch long pieces of clay and place them on the 1 inch lines of the box
5. Put these straw/cleaner units on the box and slide the straw ends out into the clay.
*Each straw-pipe_cleaner unit is a sarcomere
*The pipe_cleaner is called the thick fiber of the sarcomere.
*Myosin is the name of the thick fiber.
*The straw is called the thin fiber of the sarcomere.
*The name of the thin fiber is actin
*The clay is called the Z-line
*Z-lines are where sarcomeres connect end to end
*Sarcomeres- shortening unit of contraction in a muscle.
*The myosin has little arm that crawl inside the actin.
*In our model, the fuzz of the p_cleaner would crawl down the straws.
DRAW A PICTURE OF YOUR MODEL IN A BOX AND LABEL THE PARTS
Sarco_Drawn.JPG
Sarco_Drawn.JPG

Sarco_Drawn.JPG