Medical Quiz

Muscle Anatomy Quiz


During skeletal muscle contraction, to what do myosin heads bind?

A. the H zone

B. Z discs

C. actin filaments

D. myosin filaments

The gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell is called the ________.

A. synapse

B. sarcomere

C. cross bridge

D. motor unit

The H zone is represented by ________.

A. Label A

B. Label B

C. Label C

D. Label D

The segment of a myofibril that is called a sarcomere runs _________________________.

A. one A band to the next A band

B. between Actin and Myosin

C. from Z line to Z line

D. Between Actin filaments

The Headlines read: The anatomy class killed Mr. Cobb! First emotionally, and then physically. It was a gruesome scene, because Mr. Cobb put up a pretty good fight with his trusty stapler and bones from the dismembered skeleton. Anyway, after they killed him, they threw his body out the window in defiance in the celebration of his death. After a few hours his lifeless body began to stiffen. What is going on with Mr. Cobb’s body?

A. tetanus

B. cramps

C. rigor mortis

D. lactic acid buildup

According to the sliding filament theory, how does muscle contraction occur?

A. Both thick and thin filaments shorten as the muscle contracts.

B. Myosin heads attach and detach from thin filaments, causing thin filaments to shorten.

C. A bands bunch up and shorten as myosin heads attach to thin filaments.

D. Myosin cross bridges pull thin filaments, causing them to slide.

he A band within a myofibril is indicated by ________.

A. Label A

B. Label B

C. Label C

D. Label D

What organelle wraps and surrounds the myofibril and stores calcium?

A. sarcoplasmic reticulum

B. cross bridge

C. sarcomere

D. sarcolemma

The epimysium is represented by ________.

A. Label B

B. Label D

C. Label A

D. Label C

The plasma membrane of a skeletal muscle cell is called the ________.

A. myofilament

B. sarcoplasmic reticulum

C. sarcoplasm

D. sarcolemma

What is released by axon terminals into the synaptic cleft to stimulate a muscle to contract?

A. sodium ions

B. acetylcholine

C. actin

D. myosin heads

The I band within a skeletal muscle fiber is indicated by ________.

A. Label A

B. Label B

C. Label C

D. Label D

The mechanical force of contraction is generated by ________.

A. shortening of the thin filaments

B. the temporary disappearance of thin filaments

C. shortening of the thick filaments

D. a sliding of thin filaments past thick filaments

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

A. stabilization of joints

B. generation of heat

C. maintenance of posture

D. blood cell formation

The muscle fiber (cell) is indicated by ________.

A. Label C

B. Label B

C. Label A

D. Label D

The myofilament composed of actin is indicated by ________.

A. Label A

B. Label C

C. Label D

D. Label B

Why are calcium ions necessary for skeletal muscle contraction?

A. Calcium ions cause ATP binding to actin.

B. Calcium ions release the inhibition on Z discs.

C. Calcium ions trigger the binding of myosin heads to actin filaments.

D. Calcium ions increase the speed of the action potential transmitted along the sarcolemma.


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