Which of the following serve to increase the surface area of a cell for absorption and/or secretion?

Question

BlackTom AI · Accepted Answer

Microvilli are microscopic membrane protrusions that substantially increase a cell’s surface area, enhancing absorption and secretion.

1) Relevant knowledge points and concepts
- Microvilli: finger-like extensions of the plasma membrane supported by actin filaments; abundant on absorptive epithelia (intestinal brush border, renal proximal tubule).
- Surface area and transport: greater membrane area allows more transport proteins, channels and sites for vesicle trafficking, so absorption/secretion rates rise.
- Cilia: larger, hair-like organelles containing microtubules (9+2 arrangement) primarily for movement of fluid or sensory roles.
- Flagella: long, whip-like structures for propulsion (e.g., sperm tail in animals, bacterial flagellum for motility).
- “Tails”: ambiguous term, usually referring to flagella or appendages for movement, not to surface-area-increasing microstructures.

2) Step-by-step reasoning
- Compare each option to the function “increase surface area for absorption/secretion.”
- Microvilli: morphology (many, densely packed projections) directly increases membrane area per cell; known physiological role is increasing absorptive surface.
- Cilia: fewer per cell, longer, motile or sensory — designed to move fluid or detect signals, not to maximize area for transport.
- Flagella/Tails: singular or few long appendages used for locomotion, not to expand membrane area for exchange.

3) Calculations or quantitative context
- No numerical calculation required; conceptually, adding many microvilli multiplies cell surface area (e.g., brush border increases effective area several-fold), enabling more transporter density.

4) Why the correct answer is correct
- Microvilli provide dense, short protrusions that multiply membrane surface available for transporter proteins and endo/exocytic machinery, directly increasing absorption and secretion capacity.

5) Why other options are incorrect
- Cilia: specialized for movement of extracellular fluid or sensory detection, not primarily for increasing absorptive membrane area.
- Flagella/Tails: designed for motility; their length and low number do not significantly increase surface area for exchange.

6) Conclusion
- Therefore the correct choice is Microvilli, which matches the provided answer.

Which of the following serve to increase the surface area of a cell for absorption and/or secretion?Single choice

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