To Evaluate Cardiac Function, Scientists and Physicians Measure Both the Pressure

question 1

Multiple Choice

To evaluate cardiac function, scientists and physicians measure both the pressure and the volume inside the heart. When both pressure and volume data are plotted on the same graph, the resulting graph is called a pressure-volume loop. To create a pressure-volume loop, a catheter (a thin tube) is inserted into the vessels of the heart, and measurements of both left ventricular pressure and left ventricular volume are taken. The data are plotted on a graph, and cardiac function can then be evaluated from the distribution of the data and the shape of the loop.
The following figure shows a typical left ventricle pressure-volume loop for a healthy young adult. The cardiac cycle proceeds counterclockwise. Each complete turn around the loop (for example, starting at point A and ending back at point A) represents one complete cardiac cycle.

-If the time it takes to go around the loop is 1 second, what is the cardiac output in units of liters per minute?

• A) 3.9 L/min
• B) 4.2 L/min
• C) 7.0 L/min
• D) 8.1 L/min

Understand the concept of user cost in the context of exhaustible resources and how it impacts pricing and conservation efforts.

Describe how discount rates influence consumer decisions in purchasing durable goods and educational investments.

Explain the Hotelling rule and its application to pricing and conservation strategies for monopolists versus competitive markets.

Assess the impact of interest rates on the consumption and conservation of depletable resources.

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