What is the basic structural unit of a skeletal muscle?
The Mechanism of Muscle Contraction: Sarcomeres, Action Potential, and the Neuromuscular Junction

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Health Sciences, Chemistry, Biology, Science
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11th Grade - University
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Sarcomere
Fascicle
Myofibril
Muscle Fiber
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which protein is primarily found in the thick filaments of a sarcomere?
Actin
Troponin
Myosin
Tropomyosin
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of tropomyosin in muscle contraction?
Binds calcium ions
Blocks myosin binding sites on actin
Forms cross bridges with myosin
Stores ATP
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What initiates the sliding filament model of muscle contraction?
Formation of cross bridges
Signal from the nervous system
Binding of ATP to myosin
Release of calcium ions
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What neurotransmitter is released at the neuromuscular junction to initiate muscle contraction?
Norepinephrine
Acetylcholine
Serotonin
Dopamine
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens during depolarization in muscle cells?
Sodium ions leave the cell
Potassium ions enter the cell
Sodium ions enter the cell
Calcium ions are released
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which ion is crucial for the binding of myosin to actin during muscle contraction?
Magnesium
Sodium
Potassium
Calcium
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