Medical Quiz

Muscle Anatomy Quiz

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Which of the following puts the structures of the muscle in order from largest to smallest?

A. Whole muscle, muscle fiber, actin & myosin, myofibril, muscle fasicle

B. Whole muscle, muscle fasicle, muscle fiber, myofibril, actin & myosin

C. Whole muscle, muscle fiber, muscle fasicle, myofibril, actin & myosin

D. Whole muscle, muscle fasicle, muscle fiber, actin & myosin, myofibril


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


__________ is attached to the Z line?

A. myosin

B. actin

C. thick filament

D. troponin


How does the sarcomere shorten (contract) ?

A. The myosin filaments contract

B. The actin filaments contract

C. The myosin is pulled by the actin

D. The actin is pulled by the myosin


What is the contractile unit formed from Z line to Z line?

A. Sarcomere

B. T Tubule

C. Sarcoplasmic reticulum

D. Fascicle


The epimysium is represented by ________.

A. Label B

B. Label D

C. Label A

D. Label C


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


What is the name of the place where a nerve meets a muscle fiber

A. Nerve junction

B. Neuromuscular junction

C. Muscle junction

D. Crossbridge


What organelle wraps and surrounds the myofibril and stores calcium?

A. sarcoplasmic reticulum

B. cross bridge

C. sarcomere

D. sarcolemma


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


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.


___ and ___ are regulatory proteins bound to actin.

A. Myosin and actin

B. Glycogen and hemoglobin

C. Calcium and oxygen

D. Troponin and tropomyosin


Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.

A. Muscle cell

B. Gland

C. Neuron

D. None of the above


he A band within a myofibril is indicated by ________.

A. Label A

B. Label B

C. Label C

D. Label D


____________ attaches to actin to form the cross bridge.

A. Troponin

B. Tropomyosin

C. Myosin

D. Calcium


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