Chapter 37

Diagram a sarcomere, showing the basic organization of thin (actin) and thick (myosin) filaments. Indicate on your diagram the regions where myosin cross- bridges form with actin.

Describe the sequence of events that occurs when an action potential arrives at a muscle fiber's motor endplate, causing the muscle to be depolarized.

Describe the sequence of events involved in myosin cross-bridge attachment and detachment. Relate these events to how muscles generate force and shorten when they are stimulated to contract, identifying the role that ATP plays.

Name the two basic structural elements common to all animal musculoskeletal systems.

Compare and contrast three features of an exoskeleton and an endoskeleton.

Identify the two primary components of bone tissue and explain how each of these contributes to a bone's strength, stiffness, and resistance to fracture.