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NREMT Advanced EMT Practice Test #4

Category - EMT-I/99

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The precapillary sphincters close during what stage of shock?

Hyperactive phase
Hypoactive phase
Ischemic phase
None of the above

Explanation

Answer - C - The precapillary sphincters close during the ischemic stage of shock. Additionally, the arteriovenular shunt opens and the post capillary venules close. This allows the blood to be directed away from the capillary bed and back into the core circulation.

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