Muscle Anatomy Quiz

True or False. Skeletal muscle cells have more than one nucleus.

• True

• False

The two contractile proteins that make up the myofilaments of skeletal muscle are __________ and __________.

• actin, myosin

• actin, endomysium

• actin, perimysium

• actin, epimysium

Each muscle cell is surrounded by thin connective tissue called the:

• aponeurosis

• endomysium

• epimysium

• perimysium

The junction between a nerve fiber and a muscle cell is called a(n) __________.

• neuromuscular

• aponeurosis

• endomysium

• perimysium

Circle(True or False. The neuron and muscle fiber membranes do not actually touch but are separated by a fluid-filled gap.

• True

• False

What is the name of the complex organelle composed of bundles of myofilaments in a skeletal muscle cell?

• Sarcolemma

• Nucleus

• Myofibril

• Sarcomere

What is the term for the contractile unit of a myofibril, as shown in the enlarged view in the image?

• A band

• H zone

• Sarcomere

• Z disc

Which bands are identified as the dark bands in the muscle fiber diagram?

• I bands

• Z discs

• A bands

• H zones

What are the thin myofilaments primarily composed of?

• Actin

• Myosin

• Sarcolemma

• M line

What are the thick myofilaments primarily composed of?

• Actin

• Myosin

• Sarcolemma

• M line