You are trying to design a new drug to painlessly euthanize animals. Your plan is to design a molecule that blocks the action of one of the following pumps so that heart muscle stays contracted and blood movement is stopped. Which would be effective?

A. Na+/Ca2+-exchangers on the cell membrane
B. Ca 2+-ATPase pumps on the cell membrane
C. Ca2+-ATPase pumps on the sarcoplasmic reticulum
D. Na+/K+-ATPase pumps on the cell membrane
E. None of these would result in sustained muscle contraction


Answer: C

Anatomy & Physiology

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