Which of the Following Best Describes Some of the Major

question 12

Multiple Choice

Which of the following best describes some of the major advantages railroads had over more traditional shipping methods in the nineteenth century?

• A) The railroads had an attraction similar to roller coasters today.
• B) The railroads brought families together for Sunday afternoon rides.
• C) The railroads could be used to impress colonial populations with their "magic".
• D) Railroads could go anywhere anytime so they had more mobility than other shipping means.
• E) The railroads greatly reduced costs of shipping and personal travel.

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Definitions:

Ventricular Systole

Ventricular systole is the phase of the cardiac cycle during which the ventricles contract, pumping blood out of the heart and into the circulatory system.

Semilunar Valves

Heart valves located between the ventricles and the major arteries leaving the heart, which prevent the backflow of blood.

AV Valves

Atrioventricular (AV) valves are valves located between the atria and ventricles of the heart that prevent backflow of blood from the ventricles into the atria during contraction.

Afterload

The pressure against which the heart must work to eject blood during systole.