The Physical Barriers That Are Part of the Immune System

question 43

Multiple Choice

The physical barriers that are part of the immune system function by having _________.

• A) tightly packed epithelial cells that prevent pathogens from entering tissues
• B) mucus that traps pathogens and other foreign substances
• C) cilia that sweep mucus out of the throat
• D) A and B
• E) A, B, and C

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Definitions:

Sales

The total revenue generated from the sale of goods or services.

ROI

Return on Investment; a performance measure used to evaluate the efficiency or profitability of an investment relative to its cost.

Turnover

Turnover is a financial metric indicating the rate at which a company's inventory is sold and replaced over a specific period, or it can refer to the total sales volume.

Operating Expenses

Costs necessary for a company to conduct its day-to-day operations, excluding the cost of goods sold (COGS).