Anatomy of a Muscle Quiz

What is the basic unit of a skeletal muscle called?

• Sarcomere

• Myofibril

• Muscle fiber

• Fascicle

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

• It stores calcium ions.

• It produces ATP.

• It synthesizes proteins.

• It transports oxygen.

Which of the following structures transmits the action potential (nerve impulses) to the interior of the muscle fiber?

• Sarcolemma

• T-tubules

• Myofibrils

• Mitochondria

What is the name of the structure that connects muscle to bone?

• Ligament

• Tendon

• Fascia

• Aponeurosis

What happens to the sarcomere during muscle contraction?

• It lengthens.

• It shortens.

• It remains the same length.

• It divides.

Which ion is essential for muscle contraction and is released from the sarcoplasmic reticulum?

• Sodium

• Potassium

• Calcium

• Magnesium

What is the layer of connective tissue that surrounds the entire skeletal muscle?

• perimysium

• epimysium

• endomysium

• myofibril

A bundle of multiple muscle fibers is called

• sarcomere

• myofibril

• fascicle

• muscle cell

Skeletal muscle fibers have only one nucleus like most other cells

• True

• False

Skeletal muscle fibers contain striations, which are light and dark bands (or stripes).

• True

• False