Medical Quiz

Anatomy - Muscle Histology/NMJ/Physiology Quiz


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Which of these occurs first during a muscle contraction?

A. The nerve signal reaches the neuromuscular junction

B. Ach is released and opens Na ion channels

C. The sarcomere shortens

D. The myosin binds to the actin


What is the name of the location where the neuron and muscle fiber meet?

A. Sarcoplasm

B. Sacolemma

C. Neuromuscular junction

D. Axon terminal


What is the contractile unit of the muscle?

A. Z disk

B. Sarcomere

C. Muscle fiber

D. Muscle cell


What is the name of the plasma membrane surrounding each muscle fiber?

A. T Tubule

B. Sarcolemma

C. Sarcoplasm

D. Nucleus


Once calcium is pumped into the axon terminal what happens?

A. The muscle contracts

B. ACh is released into the synaptic cleft.

C. Sodium pumps into the sarcolemma.

D. The muscle contracts.


What protein makes up the thick filaments?

A. Troponin

B. Tropomyosin

C. Myosin

D. Actin


Which muscle characteristic allows the muscle to return to resting length after contraction?

A. Contractility

B. Excitability

C. Extensibility

D. Tension


What is the specific neurotransmitter that stimulates the movement of skeletal muscles?

A. GABA

B. Acetylcholine

C. Serotonin

D. Dopamine


The gap between the nerve cell and sarcolemma is the ____ ___.

A. Synaptic cleft

B. Neurotransmitter

C. Motor unit

D. Neuromuscular junction


Calcium is stored in the ___.

A. sarcoplasm

B. sarcolemma

C. sarcoplasmic reticulum

D. transverse tubules


___provides energy for muscle contraction and relaxation.

A. cAMP

B. ADP

C. ATP

D. M line


___forms a crossbridge with actin.

A. actin

B. myosin

C. calcium

D. ATP


What part of the muscle fiber stores Ca ions and releases them when stimulated?

A. T tubule

B. Sarcolemma

C. Nucleus

D. Sarcoplasmic reticulum


Which of these occurs last during a muscle contraction?

A. The nerve signal reaches the neuromuscular junction

B. Ach is released and opens Na ion channels

C. The sarcomere shortens

D. The myosin binds to the actin


___are thick filaments.

A. actin

B. myosin

C. troponin

D. tropomyosin


What is the name of the component that houses the neurotransmitters?

A. Synaptic cleft

B. Acetylcholine

C. Receptors

D. Synaptic vesicles


Once the action potential reaches the end of the axon terminal what takes place?

A. ACh is released into the synaptic cleft.

B. Calcium is pumped into the sarcolemma.

C. Calcium is pumped into the AT.

D. The muscle contracts.


___are thin filaments.

A. troponin

B. tropomyosin

C. actin

D. myosin




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