1. Movement
Chapter 30

2. What you need to know! How skeletal muscle contracts.
Cellular events that lead to muscle contraction.

3. Skeletal Muscle
Attached to bones by tendons and responsible for the movement of bones
Each long fiber is a single muscle cell
Each muscle fiber is a bundle of myofibrils which are made of thin filaments (actin) and thick filaments (myosin)

4. Sarcomere Smallest unit of contraction
Z lines mark the borders of sarcomeres
M line is the center of the sarcomere
Sarcomeres contract when stimulated
The sliding-filament model states that the actin (thin filaments) slide toward the M line so that they overlap the myosin (thick filaments) more during a contraction

5. Motor Neuron  Muscle
Motor units are made of neurons and the muscle fibers they control
The area where the axon of the neuron contacts the muscle fibers is the neuromuscular junction
Action potentials release acetylcholine which stimulate the muscle fibers to contract