Muscular System Vocabulary

The outermost layer of connective tissue of a
muscle is the:

• fascicle.
• epimysium.
• endomysium.
• perimysium.

The thick myofibril filament of a sarcomere is
composed of a protein:

• actin.
• myosin.
• sarcolemma.
• titin.

The muscle primarily responsible for a movement
is the:

• prime mover (agonist).
• synergist.
• antagonist.
• origin.

The neuron and the collection of muscle fibers it innervates is called the:

• neural impulse.
• motor neuron.
• muscle fiber.
• motor unit.

The functional contractile unit within muscle fiber is the:

• sarcoplasm.

• sarcolemma.

• sarcomere.

• sarcoplasmic reticulum.

The functional contractile unit within muscle fiber is the:

• actin.
• nucleus.
• mitochondrion.
• sarcomere.

According to the sliding filament model, muscle
contraction begins when:

• calcium ion concentration increases exposing binding sites.
• myosin heads pull on actin filaments.
• ATP splits to form ADP and P.
• myosin heads release the actin filaments

Muscles located in the arm that move the forearm at the elbow joint have insertions on the:

• scapula and clavicle.
• radius or ulna.
• humerus.
• carpals, metacarpals, and phalanges.

Anterior thigh muscles serve as prime movers of:

• flexion of the leg at the knee joint.
• abduction of the thigh at the hip joint.
• extension of the leg at the knee joint.
• adduction of the thigh at the hip joint.

What type of muscle is voluntary?

• Skeletal

• Cardiac

• Smotth