1. Science Starter Why do muscles get bigger when someone works out?
How do muscles get “energy”?
What does it mean for a muscle to contract?

2. Today’s Agenda Science Starter Microscopic Structure of a Muscle
Sarcomere Labeling Sheet
Midterm Grades
Exit Quiz

3. Unit 4: Skeletal & Muscular System 4
Unit 4: Skeletal & Muscular System 4.5 Microscopic Structure of a Muscle

5. Microscopic Structure of a Muscle
Fill out the note sheet using the slides around the room
Mrhoutzscience.weebly.com
You will have 15 minutes to complete
If you are done early there is a worksheet at the front to complete

6. Sarcomere Labeling Sheet
Label & Color all of the structures on the sheet
Be sure to memorize all of the major parts of a muscle (especially the sarcomere!)
If you finish with this, take a look at your midterm and fill out the unit tracker

7. Midterm Grades
Quarter 1 grades are finalized and submitted (they can’t be changed at this point!)
Midterm Exam is out of 66 points, yes short-response were part of this total!
Fill out the tracker as usual and turn it in, you can keep your midterm exam in your binder

8. What is rigor mortis?
A few hours after a person or animal dies, the joints of the body stiffen and become locked in place. This stiffening is called rigor mortis. Depending on temperature and other conditions, rigor mortis lasts approximately 72 hours. The phenomenon is caused by the skeletal muscles partially contracting. The muscles are unable to relax, so the joints become fixed in place.

9. Exit Quiz
Label the diagram using the following terms: 1. 2.
1. Tendon 2. Epimysium 3. Bone 4. Myofibril 5. Fascicle 6. Myofilament 3. 6. 4. 5.