Cardiac Output Is a Function of Heart Rate and Stroke

question 129

Multiple Choice

Cardiac output is a function of heart rate and stroke volume. In children, why is heart rate higher at rest and during exercise?

• A) Because in children, stroke volume is directly related to how much left ventricular stiffness reduces diastolic filling.
• B) Because in children, cardiac output is regulated more by peripheral resistance than V02 max by any other variable.
• C) Because children typically have a lower stroke volume compared to adults.
• D) Because children typically have a more elevated peripheral resistance compared to adults.

---

Definitions:

Contribution Margin Ratio

The percentage of each sales dollar that remains after variable costs are subtracted, indicating how much revenue contributes towards covering fixed costs and generating profit.

Tiling Grout

Tiling grout is a dense fluid used to fill gaps or joints between tiles, often for reinforcement, sealing, or decoration.

Operating Leverage

A measure of how sensitive a company's operating income is to a change in sales volume, indicating the proportion of fixed costs in its cost structure.

Tiling Grout

A dense fluid which is used to fill gaps or used as reinforcement in existing structures between tiles during installation.