Medical Quiz

Muscle Anatomy Quiz


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__________ is attached to the Z line?

A. myosin

B. actin

C. thick filament

D. troponin


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 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


____________ attaches to actin to form the cross bridge.

A. Troponin

B. Tropomyosin

C. Myosin

D. Calcium


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


___ and ___ are regulatory proteins bound to actin.

A. Myosin and actin

B. Glycogen and hemoglobin

C. Calcium and oxygen

D. Troponin and tropomyosin


A mitochondria’s role in muscle contraction is the production of…

A. Synthesis of ATP

B. Metabolism of ATP

C. Synthesis of Proteins

D. Metabolism of Worn out Proteins


What is the name of the thick myofilaments?

A. Actin

B. Myosin

C. Myoglobin

D. Titan


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


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


Power stroke will occur when

A. ATP binds to myosin head

B. Myosin head releases ADP and Pi

C. Myosin head hydrolyse ATP

D. Myosin binds to actin



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


What is released from the sarcoplasmic reticulum?

A. Inorganic phosphate

B. ADP

C. Calcium

D. ATP


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 organelle wraps and surrounds the myofibril and stores calcium?

A. sarcoplasmic reticulum

B. cross bridge

C. sarcomere

D. sarcolemma


he A band within a myofibril is indicated by ________.

A. Label A

B. Label B

C. Label C

D. Label D


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

A. the H zone

B. Z discs

C. actin filaments

D. myosin filaments


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.


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


What is necessary for the myosin to release the actin?

A. ATP

B. Calcium

C. ADP

D. Sodium


What causes the muscle to stop contracting?

A. Lack of effort

B. Myosin-Heads fail to attach

C. Calcium Ions are pumped away

D. Muscle fibre tears


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

A. myofilament

B. sarcoplasmic reticulum

C. sarcoplasm

D. sarcolemma


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




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