The Body Has Several Ways to Keep Blood Moving Forward

question 41

Multiple Choice

The body has several ways to keep blood moving forward through the veins.Which of the following does NOT explain how this happens?

• A)The pressure in the veins is lower than the pressure in the arteries (i.e.blood flows down its pressure gradient).
• B)Valves in the veins prevent backflow.
• C)The aid of respiratory pump (changes in pressure in thoracic cavity during inhalation and exhalation).
• D)The pumping of the venous endothelial contraction nodules (which act like a series of miniature hearts).
• E)The aid of contractions of skeletal muscles.

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Taxes that are the same amount for everyone, regardless of the taxpayer’s income level or ability to pay.

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The percentage of tax applied to the last dollar earned, indicating the fraction of any additional income that will be taken in taxes.

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An adjective describing the modification of financial figures to reflect changes in the purchasing power of money, allowing for comparison over time.

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