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

question 81

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.

-What part of the diagram represents ventricular diastole?

• A) point B
• B) point C
• C) the line between points A and B
• D) the line between points C and D

---

Definitions:

Novation

The act of replacing one party or obligation in a contract with another, requiring the agreement of all parties involved.

Assignment

The transfer of rights, property, or obligations from one party to another, a common practice in contracts and financial transactions.

Delegation

The process of assigning responsibility and authority to another person to carry out specific activities.

Substantial Performance

A legal concept indicating that a party has completed enough of its contractual obligations to warrant payment or another form of compensation, even if minor details remain unfulfilled.