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Step 1 Question of the Week #1

Weekly USMLE Style Question

Question of the week for 5.18.19

An avalanche traps a trekker in a mountain pass. When the rescue team is finally able to reach the accident site and find the trekker, he is no longer alive. His body is found lying prone on the ground and there is rigidity throughout his body.

Which of the following is most likely mechanism of rigidity?

A. Inability of S1 fragment of myosin II to bind actin

B. Inability of muscle cells to contract

C. Inability of muscle cells to synthesize ATP

D. Inability of muscle cells to synthesize ADP

E. Inability of sarcoplastic reticulum to sequester calcium ions

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