Which of the following has been shown to interfere with cross-bridge "cycling" during exercise? A)an accumulation of ATP B)an accumulation of H⁺ C)a decrease in Na⁺ D)a decrease in Pi (inorganic phosphate)

Question

Quizplus · Accepted Answer

An accumulation of H⁺, which are byproducts of ATP breakdown during exercise, has been shown to interfere with cross-bridge "cycling" and decrease muscle contractile force. A decrease in Pi can actually enhance cross-bridge cycling, so option D is incorrect. An accumulation of ATP or a decrease in Na⁺ would not directly interfere with cross-bridge cycling during exercise, so options A and C are also incorrect.

Which of the Following Has Been Shown to Interfere with Cross-Bridge