Chapter 8 Anatomy Review

Myofibrils are composed primarily of

• actin and myosin

• perimysium and endomysium

• ATP and ADP

• Fasica and tendons

A motor unit typically includes

• muscle fibers only

• motor neurons only

• Several motor neurons and one muscle fiber

• One motor neurons and several muscle fibers

The amount of oxygen needed to support the conversion of lactic acid to glucose by the over is called the

• oxygen debt

• lactate debt

• anaerobic value

• aerobic conversion

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Activities such as sprinting or weightlifting are most likely to stimulate development of

• slow fatigable muscle fibers

• fast fatigable muscle fibers

• slow fatigue-resistant muscle fibers

• fast fatigue-resistant muscle fibers

Compared to smooth muscle, skeletal muscle

• contracts more slowly and relaxes more slowly

• Contracts more rapidly and relaxes more rapidly

• is under involuntary control

• Contracts more slowly and relaxes more rapidly

Cardiac muscle is located in the heart.

• True

• False

Functions of muscle do not include

• the heartbeat

• production of heat

• moving body parts

• storing inorganic salts

The immovable end of a muscle is attached at its

• origin

• insertion

• motor end plate

• fascia

Exercise that includes strength training offers all of the following benefits except

• increase the body's energy efficiency

• lowers blood pressure

• decreases the risks of developing arthritis and osteoporosis

• increases bone density and bone length

The sheet of dense connective tissue that separates individual muscles and helps hold them in position is called

• fascicles

• fascia

• epimysium

• endomysium