A Person Who Sits for Hours on a Long Airplane

question 29

Multiple Choice

A person who sits for hours on a long airplane flight may have problems with blood pooling below the knees.Why?

• A) The valves in the leg veins don't work above a certain altitude.
• B) Blood pressure drops on long airplane flights.
• C) The respiratory pump is not helping blood return to the heart.
• D) The capillaries expand at high altitudes.
• E) The skeletal muscle pump below the knees is not helping blood return to the heart.

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