Muscular System Quiz

Which of the following is NOT a function of the muscular system?

• Produce movement

• Maintain posture

• Generate electricity

• Stabilize joints

What characteristic of muscle tissue allows it to return to its original shape after being stretched?

• Excitability

• Contractility

• Extensibility

• Elasticity

Which type of muscle cell is described as cylindrical, striated, and multinucleated?

• Skeletal

• Cardiac

• Smooth

• Elastic

Cardiac muscle cells are known for which of the following characteristics?

• Voluntarily controlled and nonstriated

• Involuntarily controlled and striated

• Involuntarily controlled and nonstriated

• Voluntarily controlled and striated

Smooth muscle cells are unique because they:

• Are striated and voluntarily controlled

• Have slow contractions and are arranged in uniform layers

• Contract quickly and are multinucleated

• Are branched and have multiple nuclei

What are the two types of myofilaments found in muscle fibers?

• Actin and myosin

• Myoglobin and sarcoplasm

• Myofibril and sarcomere

• Actin and hemoglobin

What is the role of myofilaments in muscle fibers?

• They store energy for muscle contractions.

• They are responsible for the sliding model of contraction.

• They provide structural support to the muscle fiber.

• They transmit nerve impulses to the muscle fiber.

What is the correct order of muscle structure from largest to smallest?

• Muscle, fascicle, muscle fiber, myofibril, myofilaments

• Myofilaments, myofibril, muscle fiber, fascicle, muscle

• Muscle fiber, fascicle, muscle, myofibril, myofilaments

• Myofibril, myofilaments, muscle fiber, muscle, fascicle

What is the term for the repeating unit of a myofibril that is responsible for muscle contraction?

• Myofilament

• Sarcomere

• Muscle fiber

• Fascicle

What is the function of the sarcoplasmic reticulum in muscle fibers?

• It is responsible for the sliding model of contraction.

• It stores and releases calcium ions during muscle contraction.

• It transmits nerve impulses to the muscle fiber.

• It provides structural support to the muscle fiber.