A 60-Year-Old Woman in the Intensive Care Unit Has a Large

question 7

Multiple Choice

A 60-year-old woman in the intensive care unit has a large arteriovenous fistula. Her cardiac output is 10 L/min, oxygen consumption is 250 mL/min, and pulmonary vein oxygen concentration is 180 ml/L. What is the pulmonary artery oxygen concentration (in ml/L) ?

• A)145
• B)155
• C)165
• D)185
• E)205

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Definitions:

Synovial Fluid

A viscous fluid found in the cavities of synovial joints, lubricating and nourishing the cartilage and bones within the joint.

Friction

The resistance that one surface or object encounters when moving over another.

Hydrostatic Skeleton

A structure found in many soft-bodied organisms that uses water pressure inside the body to maintain shape and facilitate movement.

Endoskeleton

An internal support structure of the body, found in vertebrates, providing framework and protection for the body's organs.