Which of these statements is true? a. The heart can produce a graded contraction. b. The heart can..

Which of these statements is true?

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a. The heart can produce a graded
contraction.

b. The heart can produce a sustained
contraction.

c. The action potentials produced at each
cardiac cycle normally travel around the heart in circus rhythms.

d. All of the myocardial cells in the
ventricles are normally in a refractory period at the same time.

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