The muscles of the back, which are most susceptible to injury during heavy lifting, belong to the __________ muscle group. a. quadratus lumborumb. erector spinaec. semispinalisd. splenius  

Isometric contractions come into play when an individual is __________. a. jumpingb. walking uphillc. moving a heavy objectd. maintaining an upright posture  

All of these muscles insert onto the humerus EXCEPT the ________. a. triceps brachiib. deltoidc. pectoralis majord. latissimus dorsi

Which muscle group is involved when a “pulled groin” occurs? A) quadricepsB) thigh adductorsC) lateral rotatorsD) hamstrings  

Which class of levers has the load between the fulcrum and effort? a. First classb. Second classc. Third classd. Fourth class  

The contractile units of skeletal muscles are ________. A) microtubulesB) mitochondriaC) T tubulesD) myofibrils  

Muscle power is primarily dependent on __________. a. the degree to which a muscle can shortenb. the number of cells in the musclec. the muscle’s shaped. the direction of fibers in the muscle  

Most of the skeletal muscles in our bodies are classified as ________. a. first classb. second classc. third classd. All of the above are equally distributed in our bodies.

The _______ muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis. a. shoulder bladeb. rotator cuffc. humerusd. arm extender  

All of these muscles insert onto the humerus EXCEPT the ________. a. triceps brachiib. deltoidc. pectoralis majord. latissimus dorsi