There Are Microvilli on the Luminal (Apical)surface of the Epithelium

question 28

Multiple Choice

There are microvilli on the luminal (apical) surface of the epithelium that lines the lumen of the proximal tubule.Microvilli are structural features designed to

• A)maximize surface area available to pump ions into the renal tubule.
• B)maximize surface area available for reabsorption of solutes from the renal tubule.
• C)accommodate membrane proteins involved in active transport of substances into the rental tubule.
• D)provide adequate space to house membrane proteins involved in active transport of solutes out of the renal tubule.

---

Definitions:

Short Run

A period of time during which at least one of a firm's inputs is fixed, limiting its ability to adjust to changes in market demand or supply.

Many Firms

A situation in a market where numerous firms compete against each other to sell their products or services.

Perfect Competition

A market structure characterized by a large number of buyers and sellers, homogeneous products, and easy entry and exit, leading to price-taking behavior.

Most Efficient Output

The level of production at which a firm or economy can produce goods at the lowest average cost, maximizing the use of resources.