What muscle energy source quickly recharges ATP by donating a phosphate? 

What creates the striations visible under a microscope in relaxed skeletal and cardiac muscles?

What does myoglobin in a muscle fiber bind to? 

Select all of the following muscles that form the rotator cuff. 

Label the diagram of a muscle sarcomere by matching the terms below to the numbers on the diagram. (This question is worth 2 points)

How do calcium ions contribute to skeletal muscle contraction? 

Which term describes the location where two or more bones come together? 

An intramuscular (IM) injection into the hip is usually administered into what muscle? 

What type of activity are fast-twitch glycolytic (FG, or Type IIb) muscle fibers best suited for? 

Select all of the following ways joints are classified.