The Site of an Injury Like a Scratch or a Splinter

question 39

Multiple Choice

The site of an injury like a scratch or a splinter initially becomes red and painful.In some instances a yellowish thickened fluid may be present at the injury site.Commonly called pus,this fluid is

• A) blood plasma and the dead neutrophils,macrophages,and bacteria that have accumulated at the wound.
• B) the surviving bacteria that have been successful in avoiding the innate immune response.
• C) dead body cells collaterally killed by the activation of the complement system.
• D) the coagulated cytoplasm and hemoglobin produced by the blood cells injured during the infection.

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Definitions:

Financial Break-even

The point at which total revenue equals total costs and expenses, leaving the company with no net profit or loss.

Variable Cost

Costs that move in correspondence with the quantity of products made or services sold.

Fixed Costs

Expenses that do not vary with production volume or business activity level, such as rent, salaries, and insurance premiums.

Operating Leverage

A measure of how revenue growth translates into growth in operating income, indicating the extent to which a firm uses fixed versus variable costs.