Which of the following plasma membrane structures primarily function to increase surface area for absorption of substances?

• A. Desmosomes
• B. Gap junctions
• C. Microvilli
• D. Cilia

Answer: (C)

Verified step by step guidance

1. Understand the question: The problem is asking which plasma membrane structure is specialized to increase surface area for absorption of substances. This requires knowledge of the structure and function of cellular components.
2. Review the options: The options provided are Desmosomes, Gap junctions, Microvilli, and Cilia. Each of these has a distinct structure and function in the cell.
3. Analyze the function of each option: Desmosomes are involved in cell-to-cell adhesion, Gap junctions facilitate communication between cells, Microvilli are finger-like projections that increase surface area, and Cilia are hair-like structures involved in movement or sensing the environment.
4. Focus on the key phrase 'increase surface area for absorption': Among the options, Microvilli are specifically adapted for this function. Their structure maximizes the surface area available for processes like nutrient absorption in the intestines.
5. Conclude the reasoning: Based on the analysis, Microvilli are the plasma membrane structures that primarily function to increase surface area for absorption of substances.