Medical Quiz

Anatomy - Muscle Histology/NMJ/Physiology Quiz


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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


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

A. GABA

B. Acetylcholine

C. Serotonin

D. Dopamine


What is the contractile unit of the muscle?

A. Z disk

B. Sarcomere

C. Muscle fiber

D. Muscle cell


Calcium is stored in the ___.

A. sarcoplasm

B. sarcolemma

C. sarcoplasmic reticulum

D. transverse tubules


___forms a crossbridge with actin.

A. actin

B. myosin

C. calcium

D. ATP


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


___are thin filaments.

A. troponin

B. tropomyosin

C. actin

D. myosin


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

A. Synaptic cleft

B. Acetylcholine

C. Receptors

D. Synaptic vesicles


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

A. Contractility

B. Excitability

C. Extensibility

D. Tension


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

A. T Tubule

B. Sarcolemma

C. Sarcoplasm

D. Nucleus


___are thick filaments.

A. actin

B. myosin

C. troponin

D. tropomyosin


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

A. T tubule

B. Sarcolemma

C. Nucleus

D. Sarcoplasmic reticulum


What protein makes up the thick filaments?

A. Troponin

B. Tropomyosin

C. Myosin

D. Actin


___provides energy for muscle contraction and relaxation.

A. cAMP

B. ADP

C. ATP

D. M line


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

A. Sarcoplasm

B. Sacolemma

C. Neuromuscular junction

D. Axon terminal


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

A. Synaptic cleft

B. Neurotransmitter

C. Motor unit

D. Neuromuscular junction


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.


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.




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