Pinocytosis: engulfs liquids and small particles. Which statement is correct?

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Study for the Pharmaceutics Xenobiotics Across Bio Membrane Test. Prepare with flashcards and multiple-choice questions, each providing hints and explanations. Get ready for your pharmacy exam!

Multiple Choice

Pinocytosis: engulfs liquids and small particles. Which statement is correct?

Explanation:
Pinocytosis is a form of endocytosis that samples extracellular fluid and dissolved substances by forming small vesicles from the plasma membrane, effectively the cell’s way of “drinking” its surroundings. This describes why the statement is correct: it captures liquids and small particles, not large matter. It’s generally non-specific and does not rely on receptor binding, which distinguishes it from receptor-mediated endocytosis. In contrast, taking in large particles is the realm of phagocytosis, often by macrophages, and exocytosis is about expelling material from the cell, not taking it in.

Pinocytosis is a form of endocytosis that samples extracellular fluid and dissolved substances by forming small vesicles from the plasma membrane, effectively the cell’s way of “drinking” its surroundings. This describes why the statement is correct: it captures liquids and small particles, not large matter. It’s generally non-specific and does not rely on receptor binding, which distinguishes it from receptor-mediated endocytosis. In contrast, taking in large particles is the realm of phagocytosis, often by macrophages, and exocytosis is about expelling material from the cell, not taking it in.

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