AP HESIS TEST muscle system

Which of the following correctly describes the function of the muscular system?

Posture and thermoregulation

Which type of muscles have striated muscle fibers that join at the intercalated disc?

Cardiac muscle

Which of the following correctly describes the skeletal muscles?

Striated, multinucleated cylindrical fibers

Which of the following contains nonstriated muscle fibers?

The intestine

Muscles attach to the bones through a _______________.

Tendon

The rod-like structure that makes up muscle fibers is called _____________.

Myofibrils

The functional unit of the myofibril is called ____________.

Sarcomere

Which group of muscles increases the angle at a joint?

Extensors

The pectoralis major pulls the arm towards the midline. This movement is called _________.

Adduction

Which of the following describes flexion?

Decreases the angle at a joint

Which of the following terms and descriptions is correctly paired?

Adduction—towards the midline

Which of the following is not a part of the thin myofilament?

Myosin

Which of the following cleaves ATP to generate energy for muscle contraction?

Myosin

What is the role of calcium in muscle contraction?

Calcium binds to troponin and leads to the uncovering of the active site of actin

During muscle contraction, calcium molecules are released from ____________.

Sarcoplasmic reticulum

Contraction occurs because of cross bridges between myosin and _____________.

Actin

Which of the following correctly describes the process of muscle contraction?

Action potential-release of calcium-calcium binding to inhibitory proteins-cross bridges between actin and myosin-filament use energy from ATP to slide together-contraction

Which of the following muscles is under voluntary control?

Triceps muscle

Which of the following are correctly paired skeletal muscles?

Pronator and supinator

Which of the following correctly describes synergist muscles?

Muscles that produce similar movement as the primary mover

Flexion

reduces the angle at a joint

Extension

increases the angle at a joint

Adduction

Movement towards the midline

Abduction

Movement away from the midline

supination

rotates forearm so that the palm faces anteriorly

pronation

rotates forearm so that the palm faces posteriorly

inversion

turns the sole inwards

Eversion

tuns the sole outwards

internal ( medial ) rotation

rotates the anterior surface towards the midline

External ( lateral ) rotation

Rotates the anterior surface away from the midline