Muscular System Test Review

Front

Which statement about muscle tissue is NOT correct? Options: an individual muscle cell is called a muscle fiber, in muscle cells, the cytoplasm is called the sarcoplasm, the sarcomere is the space between the thick and thin filaments, the actin filaments are the ones that actually slide during contraction.

Back

the sarcomere is the space between the thick and thin filaments

Front

Which statement is NOT true of skeletal muscle activity? Options: typically, muscles cross at least one joint, the bulk of the muscle lies proximal to the joint crossed, all muscles have at least two attachments, during contraction, the muscle origin moves towards the insertion

Back

during contraction, the muscle origin moves towards the insertion

Front

Which number most closely approximates the number of skeletal muscles in the human body? Options: 206, 640, about a 1,000, several thousand

Back

640

Front

The heads of the myosin filaments are called __ when they link the thick and thin filaments together during skeletal muscle contraction.

Back

crossbridges

Front

The sliding filament theory involves the sliding of the __ during skeletal muscle contraction as each crossbridge attaches and detaches several times.

Back

actin filaments

Front

The connective tissue covering that surrounds an entire muscle is: endomysium, perimysium, tendon, epimysium

Back

epimysium

Front

Which of the following is NOT a function of the muscular system? Options: production of movement, stabilization of joints, hematopoiesis, generation of heat

Back

hematopoiesis

Front

What best explains the condition of skeletal muscle fatigue?

Back

the result of oxygen debt

Front

Which of the following statements is NOT true? Options: Muscles can only pull., Contractility refers to the muscles ability to shorten., When a muscle relaxes, it pushes on the insertion., Isotonic contractions result in sliding myofilaments and muscle movement.

Back

When a muscle relaxes, it pushes on the insertion.

Front

Which of the following is NOT a common effect of aging on skeletal muscles? Options: muscles become larger due to an increase in fat, loss of muscle mass, decrease in muscle strength, muscles become more stringy due to increase in mass of connective tissue

Back

muscles become larger due to an increase in fat