1. Science Starter
List the connective tissue coverings of skeletal muscle, from largest to smallest
What are the two main proteins found in the sarcomere? (hint: one is thin and one is thick)
What is the major neurotransmitter at a neuromuscular junction?

2. Today’s Agenda Science Starter Internet Investigation
Sliding Filament Color Sheet
Exit Quiz

3. Exit Quiz
Label the diagram using the following terms: 1. 2. 3. 6. 4. 5.

4. Internet Investigation
**Don’t do #11**
With a partner grab a computer and go to my website
Mrhoutzscience.weebly.com
Use “link 1” and “link 2” to complete the worksheet
When you finish the worksheet turn it in to the blue bin and pick up a sliding filament color sheet
Color the sheet according to the directions and then place it in your binder

5. What is the first step in muscle contraction?
What ion is released into sarcoplasm?
What is the difference between a contracted and relaxed sarcomere?
What gets “shorter” during contraction?

7. Actin Filaments

8. Exit Quiz
Draw the sarcomere structure for a muscle when it is contracted and for a muscle when it is extended (relaxed)
Label: actin, myosin, H zone, and Z line