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Action Potentials and Muscle Contraction (Quiz 2)

View the animation below, then complete the quiz to test your knowledge of the concept.






1An action potential causes calcium ions to diffuse from the ________ into the ________.
A)sarcoplasmic reticulum ; sarcolemma
B)sarcoplasmic reticulum ; sarcoplasm
C)sarcoplasm ; sarcoplasmic reticulum
D)sarcoplasm ; sarcolemma
E)sarcolemma ; sarcoplasm



2Which of the following best describes the role of Ca2+ in muscle contraction?
A)It binds to tropomyosin, moving troponin, so that myosin heads can bind to actin.
B)It binds to tropomyosin, moving troponin, so that actin heads can bind to myosin.
C)It binds to troponin, moving tropomyosin, so that myosin heads can bind to actin.
D)It binds to troponin, moving tropomyosin, so that actin heads can bind to myosin.
E)It binds to actin, moving myosin, so that troponin can bind to tropomyosin.



3All of the following are filamentous proteins EXCEPT
A)actin.
B)myosin.
C)troponin.
D)tropomyosin.
E)troponin and tropomyosin.



4An action potential causes depolarization of the T tubule membrane.
A)True
B)False



5T-tubules are invaginations of the sarcolemma of a muscle cell.
A)True
B)False







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