1.   What is the primary function of the muscular system?

2.   What are muscle fibers?
      What is the function of tendons? What are tendons made of and how do they attach?
      What is an origin, an insertion?

3.   Where are the biceps brachii and triceps brachii?
      How do they work as antagonistic muscles to flex and extend the forearm?
      What do the authors mean when they say some muscles must contract while others relax?

4.   How do synergistic muscles function differently from antagonistic muscles?

5.   What is meant by "muscle tone" and "muscle sense?"  How do they differ?

6.   What are isotonic and isometric exercises?  How are they different and what do they accomplish?

7.   What are the roles of ATP, creatine phosphate and glycogen as energy sources for the muscle?
      What is the role oxygen?
      What causes oxygen debt?
      What are hemoglobin and myoglobin?
      Lactic acid?

8.   Describe the microscopic structure of a muscle fiber using the following terms:  neuromuscular junction,
       acetylcholine, cholinesterase, synapse, sarcomere, myofibril, myosin, actin, sarcoplasmic reticulum.
      What is the role of calcium?

9.   What does the sliding filament theory explain?

10.  Here we go again, what happens to the muscle system as we age?