Muscular System Test A
Quiz
•
Science
•
9th - 12th Grade
•
Medium
D. V.
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40 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Myoglobin ________.
breaks down glycogen
is a protein involved in the direct phosphorylation of ADP
stores oxygen in muscle cells
produces the end plate potential
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?
calcium ions returning to the terminal cisternae
the tropomyosin blocking the myosin once full contraction is achieved
acetylcholinesterase breaks apart the ACh
the action potential stops going down the overloaded T tubules
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does excess postexercise oxygen consumption represent?
amount of oxygen needed for aerobic activity to accomplish the same amount of work
the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used
the amount of oxygen equal to the oxygen already used
the amount of oxygen taken into the body immediately after the exertion
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the functional unit of a skeletal muscle called?
a sarcomere
the sarcoplasmic reticulum
a myofibril
a myofilament
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the role of tropomyosin in skeletal muscles?
Tropomyosin is the chemical that activates the myosin heads.
Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
Tropomyosin is the receptor for the motor neuron neurotransmitter.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which muscle cells have the greatest ability to regenerate?
skeletal
cardiac
smooth
no muscle can regenerate
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Most skeletal muscles contain ________.
muscle fibers of the same type
a mixture of fiber types
a predominance of slow oxidative fibers
a predominance of fast oxidative fibers
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