The sarcomere length of isolated heart myoblasts can be measured over time in the laboratory.The myoblasts are maintained in a buffer during the experiment.In a control experiment,Ca²⁺ and ATP are added to the buffer and the change in sarcomere length is analyzed.If EDTA,a chelating agent that sequesters Ca²⁺,was included in the buffer,the length change would be __________ compared with a control experiment without EDTA. A) smaller B) greater C) the same D) There is no way to determine the result given the information provided.

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Quizplus · Accepted Answer

EDTA sequesters Ca²⁺, which is necessary for muscle contraction. Therefore, if EDTA is included in the buffer, the change in sarcomere length will be smaller compared to a control experiment without EDTA.

The Sarcomere Length of Isolated Heart Myoblasts Can Be Measured