1. Ch. 12 Muscle Three types of muscle Skeletal muscle Anatomy
Arrangement of muscle fibers
Filaments in muscle fibers
Proteins in muscle filaments
Other parts of muscle fibers

2. Three types of muscle
Skeletal muscle
Cardiac muscle
Smooth muscle

3. Muscles generate movement and force.
Sometimes muscles generate force without movement.
The muscle is a collection of muscle cells.
Each muscle cell is called a muscle fiber.
The muscle contains muscle fibers, blood vessels, nerve fibers, connective tissue.
The muscle cell (fiber) is multinucleated.

4. Motor unit
A single motor neuron and all the muscle fibers that it innervates.

5. Muscle fiber anatomy: lots of myofibrils

6. Myofibrils are contractile elements.
Thick filaments: myosin
Thin filaments:actin

7. Sarcomere
Thick filament (myosin)
Thin filament (actin)
M line

8. M line

9. (F-actin polymers)

10. Other components of the muscle fiber

14. Nebulin, not elastic, helps to align the actin filament
Titin, a huge elastic molecule stabilizes the position of the contractile proteins
And returns sarcomere to its resting length after stretching.