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Animation: Action Potentials and Muscle Contraction
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View the animation below, then complete the quiz to test your knowledge of the concept.

1An action potential enters a neuron...
A)by diffusion.
B)by the T-tubules.
C)by the sarcolemma.
D)by the sarcoplasmic reticulum.
E)by the actin myofilament.

2What structures do the calcium ions bind to when muscle contraction is initiated?
A)the actin myofilament.
B)the troponin molecule.
C)the tropomyosin molecule.
D)the sarcoplasmic reticulum.
E)the sarcolemma.

3Cross bridges form between...
A)troponin and tropomyosin.
B)calcium and sodium.
C)the sarcolemma and the sarcoplasmic reticulum.
D)the T-tubules and the sarcolemma.
E)the actin filaments and the myosin heads.

4An action potential introduced at the neuromuscular junction is propagated along the sarcoplasmic reticulum.

5In response to an action potential entering the neuron, calcium ions diffuse from the sarcolemma into the sarcoplasm.

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