Which of the Following Statements About the Cardiac Cycle Is

question 78

Multiple Choice

Which of the following statements about the cardiac cycle is TRUE?

• A)The duration of systole is greater than that of diastole in a subject at rest.
• B)During isovolumetric ventricular relaxation,blood flows from the atria into the ventricles.
• C)Closure of the atrioventricular valves occurs at the beginning of ventricular systole.
• D)The QRS complex occurs at approximately the same time as the closure of the semilunar valves.
• E)The first valves to go from closed to open after the atrial kick are the atrioventricular valves.

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Definitions:

Fixed Costs

Expenses that do not change with changes in the level of production or sales, such as rent, salaries, and insurance.

Contribution Margin

The amount by which a product's sales price exceeds its variable costs, used to cover fixed costs and generate profit.

Unit Contribution Margin

The difference between the selling price per unit and the variable cost per unit; an important metric in understanding per unit profitability and in break-even analysis.

Fixed Costs

Expenses that do not change with the level of production or sales, such as rent, salaries, and insurance premiums.