Standing Still and at Attention for Long Periods Can Result

question 15

Multiple Choice

Standing still and at attention for long periods can result in inadequate venous return.The effects of this can be seen when even young and healthy soldiers sometimes faint when standing at attention for long periods.Which of the following is NOT occurring to promote return of blood from the venous system in this situation?

• A)sympathetic activation of smooth muscle in large veins
• B)skeletal muscle activity compressing veins and forcing blood flow
• C)one way flow in the venous system due to valves
• D)ventricular contraction

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