Students Arrive at a University Business Library During Peak Evening

question 29

Multiple Choice

Students arrive at a university business library during peak evening hours at a rate of 40 students every half hour. A periodic count shows that there are 200 students in the library at any one time. On average, how long is each student's stay in the library?

• A) less than or equal to one hour
• B) greater than 1.0 but less than or equal to 2.0 hours
• C) greater than 2.0 but less than or equal to 3.0 hours
• D) greater than 3.0 hours

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Definitions:

Preload

The degree of stretch of the cardiac muscle fibers at the end of diastole, prior to contraction; it affects the force of contraction and cardiac output.

Stroke Volume

The amount of blood the heart pumps out of a ventricle with each beat.

End-diastolic Volume

The volume of blood in the ventricles at the end of diastole, just before the heart contracts, important for determining cardiac function and performance.

Erythrocytes

Red blood cells, which are responsible for carrying oxygen from the lungs to the body's tissues and returning carbon dioxide from the tissues back to the lungs.