Myofibril+Activity

Myofibril (Tiny Muscle Fiber) Activity
 * [[image:room114:Sarcomere_straw_cleaner_sm.jpg]] ||
 * Sarcomere_straw_cleaner_sm.jpg ||


 * [[image:room114:Sarcomere.gif caption="Sarcomere.gif"]] ||
 * Sarcomere.gif ||

In this activity we will make a model of the contracting units of mucles. 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.
 * 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.
 * 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**
 * [[image:room114:Sarco_Drawn.JPG caption="Sarco_Drawn.JPG"]] ||
 * Sarco_Drawn.JPG ||