A process by which liquid droplets are ingested by a living cell is known as?

Appeared in: BSF Staff Nurse - 2021

Explanation

Pinocytosis is the correct term for the cellular ingestion of liquid droplets and the small solutes dissolved within them.
The name itself provides a clue, derived from Greek 'pino-' (to drink) and 'cytosis' (cell process), literally meaning 'cell drinking'.
This process is crucial for the bulk transport of fluids and nutrients into the cell, occurring in most cell types.
Unlike phagocytosis, which engulfs large solid particles, pinocytosis involves the formation of small vesicles around the fluid.

Option B: Phagocytosis involves the ingestion of large, solid particles like bacteria or cellular debris, not liquid droplets. It is often called 'cell eating'.
Option C: Cytosis is a general, non-specific term that refers to any process of moving materials across a cellular membrane. It is not specific to the ingestion of liquid.
Option D: This option is incorrect because a correct answer, Pinocytosis, is provided in the options.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Cellular transport mechanisms, specifically the types of endocytosis as background academic context rather than a clinical decision trigger.
Understanding pinocytosis is relevant to nutrient absorption in places like the renal tubules and the intestinal epithelium, where cells absorb fluids and solutes.
The related process of receptor-mediated endocytosis is clinically significant as it's the mechanism many viruses (like hepatitis, polio, and SARS-CoV-2) use to enter and infect cells.
Phagocytosis is a cornerstone of the immune system, where phagocytic cells like neutrophils and macrophages engulf and destroy pathogens. A failure in this process can lead to severe, recurrent infections.

How to Approach the Question

First, identify the key terms in the question: 'liquid droplets' and 'ingested by a cell'.
Analyze the prefixes of the options. 'Pino-' means 'to drink', 'phago-' means 'to eat', and 'cyto-' means 'cell'.
Relate the prefixes to the key terms. 'Cell drinking' (Pinocytosis) directly corresponds to the ingestion of 'liquid droplets'.
Evaluate the other options. 'Cell eating' (Phagocytosis) is for solids. 'Cytosis' is too general.
Conclude that Pinocytosis is the most specific and accurate term for the process described.

Concept Tested & Keywords

Concept Tested: Cellular transport mechanisms, specifically the types of endocytosis.
Stem keywords: process, liquid droplets, ingested, living cell
Lead-in keywords: known as

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E6 Physiology Guyton 4SAE Part 1 p. 46-48

E6 Harper's Illustrated Biochemistry2023 (pp 26-793 of 813) p. 466-468

Practise the full BSF Staff Nurse - 2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.