Medical Quiz

Muscle Anatomy Quiz


What organelle wraps and surrounds the myofibril and stores calcium?

A. sarcoplasmic reticulum

B. cross bridge

C. sarcomere

D. sarcolemma

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

A. the H zone

B. Z discs

C. actin filaments

D. myosin filaments

What does the sarcoplasmic reticulum do?

A. Stores sodium

B. Stores ATP

C. Releases sodium

D. Stores calcium

he A band within a myofibril is indicated by ________.

A. Label A

B. Label B

C. Label C

D. Label D

The muscle fiber (cell) is indicated by ________.

A. Label C

B. Label B

C. Label A

D. Label D

What is necessary for the myosin to release the actin?


B. Calcium


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 epimysium is represented by ________.

A. Label B

B. Label D

C. Label A

D. Label C

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

What does calcium do to the actin?

A. Covers myosin binding sites

B. Uncovers myosin binding sites

C. Covers actin binding sites

D. Uncovers actin binding sites

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

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

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

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 is the name of the neurotransmitter released at a neuromuscular junction?

A. Calcium

B. Acetylcholine

C. Dopamine

D. Troponin

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 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

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 the name of the thick myofilaments?

A. Actin

B. Myosin

C. Myoglobin

D. Titan

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

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

The myofilament composed of actin is indicated by ________.

A. Label A

B. Label C

C. Label D

D. Label B

Which of the following refers to the muscle cell?

A. Myofibril

B. Myofilament

C. Fascicle

D. Muscle fiber

Which is more true to cause muscle contraction?

A. Actin Pulls on the myosin

B. Myosin Pulls on the Titin

C. Myosin Pulls on Actin

D. Actin Pulls on Titin

___ and ___ are regulatory proteins bound to actin.

A. Myosin and actin

B. Glycogen and hemoglobin

C. Calcium and oxygen

D. Troponin and tropomyosin


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