Anatomy - Muscle Histology/NMJ/Physiology Quiz
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What is the specific neurotransmitter that stimulates the movement of skeletal muscles?
A. GABA
B. Acetylcholine
C. Serotonin
D. Dopamine
Calcium is stored in the ___.
A. sarcoplasm
B. sarcolemma
C. sarcoplasmic reticulum
D. transverse tubules
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
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
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.
What is the name of the location where the neuron and muscle fiber meet?
A. Sarcoplasm
B. Sacolemma
C. Neuromuscular junction
D. Axon terminal
___forms a crossbridge with actin.
A. actin
B. myosin
C. calcium
D. ATP
Which muscle characteristic allows the muscle to return to resting length after contraction?
A. Contractility
B. Excitability
C. Extensibility
D. Tension
The gap between the nerve cell and sarcolemma is the ____ ___.
A. Synaptic cleft
B. Neurotransmitter
C. Motor unit
D. Neuromuscular junction
What part of the muscle fiber stores Ca ions and releases them when stimulated?
A. T tubule
B. Sarcolemma
C. Nucleus
D. Sarcoplasmic reticulum
___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
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 is the contractile unit of the muscle?
A. Z disk
B. Sarcomere
C. Muscle fiber
D. Muscle cell
___provides energy for muscle contraction and relaxation.
A. cAMP
B. ADP
C. ATP
D. M line
What protein makes up the thick filaments?
A. Troponin
B. Tropomyosin
C. Myosin
D. Actin
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