What does it mean when we say cardiac muscle contraction is a graded contraction?

Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter9: Cardiac Physiology
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What does it mean when we say cardiac muscle contraction is a graded contraction?

 

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