Refer to This Figure to Determine Which of the Following

question 9

Multiple Choice

Refer to this figure to determine which of the following statements is correct.

• A) Lamellae bring air within diffusing distance of each body cell.
• B) Blood and water are flowing in opposite directions (countercurrent).
• C) Oxygen diffuses out of blood as it flows through lamellae.
• D) Blood and water are flowing in the same direction (concurrent).

---

Definitions:

AVC Curve

Short for average variable cost curve, it represents the variable cost per unit of output.

Marginal Cost

Marginal Cost is the cost incurred to produce one additional unit of a product or service, crucial for decision-making on production levels and pricing strategies.

Variable Cost

A cost that changes in proportion to the level of output or activity.

Fixed Cost

Costs that do not change with the level of production or sales, such as rent, salaries, and insurance.