Why Do New Red Blood Cells Survive for Only a Few

question 33

Multiple Choice

Why do new red blood cells survive for only a few months?

• A)The heart pumps red blood cells so often that their membranes deteriorate.
• B)The oxygen that red blood cells carry damages their organelles.
• C)Red blood cells do not have most organelles or a nucleus.
• D)The hemoglobin that red blood cells carry is toxic.

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Definitions:

Variable Costs

Costs that change in proportion to the level of activity or volume of production in a business.

Total Fixed Costs

The total of all expenses that stay the same no matter the amount of production or output.

Average Total Costs

The total cost of production (fixed and variable costs combined) divided by the number of units produced; it shows the cost per unit of output.

Variable Costs

Costs that change in proportion to the level of output in the production process.