contractile vacuole: meaning, definition, pronunciation and examples
Low (Scientific/Life Sciences)Technical/Scientific, Academic
Quick answer
What does “contractile vacuole” mean?
A membrane-bound organelle found in certain single-celled organisms, particularly freshwater protists, that pumps excess water out of the cell.
Audio
Pronunciation
Definition
Meaning and Definition
A membrane-bound organelle found in certain single-celled organisms, particularly freshwater protists, that pumps excess water out of the cell.
A specialized cellular structure responsible for osmoregulation, actively collecting and expelling water from the cell's cytoplasm to maintain internal pressure and prevent rupture.
Dialectal Variation
British vs American Usage
Differences
Spelling and usage are identical. Potential minor differences in secondary school vs. high school textbook phrasing.
Connotations
Purely technical, no connotative differences.
Frequency
Equally low frequency in both dialects, confined to biological sciences.
Grammar
How to Use “contractile vacuole” in a Sentence
The contractile vacuole of [organism]...[Organism] uses its contractile vacuole to...The primary function of the contractile vacuole is...Vocabulary
Collocations
Examples
Examples of “contractile vacuole” in a Sentence
verb
British English
- The vacuole contractiles rhythmically.
- The organelle is contracting.
American English
- The vacuole contracts rhythmically.
- The organelle contracts.
adjective
British English
- The contractile-vacuolar complex was examined.
- It exhibits a contractile cycle.
American English
- The contractile-vacuole complex was examined.
- It exhibits a contractile cycle.
Usage
Meaning in Context
Business
Not used.
Academic
Standard term in cell biology and zoology textbooks, laboratory reports, and exams.
Everyday
Not used in everyday conversation.
Technical
Precise term used in research papers, scientific descriptions, and microscopy.
Vocabulary
Synonyms of “contractile vacuole”
Neutral
Weak
Watch out
Common Mistakes When Using “contractile vacuole”
- Mispronunciation: 'contract-*tile*' (like floor tile) instead of 'contract-*tile*' (with a clear long 'i').
- Confusing it with a food vacuole or other cellular vesicles.
- Misspelling as 'contractible vacuole'.
FAQ
Frequently Asked Questions
No. Human cells and multicellular organisms have other, more complex systems (like kidneys) for osmoregulation. Contractile vacuoles are primarily for single-celled organisms in freshwater.
The rate varies by species and environmental conditions but can be quite rhythmic, from every few seconds to a minute or more, depending on water influx.
No. A plant's central vacuole is primarily for storage, structure, and waste, not for active, rhythmic expulsion of water for osmoregulation.
The cell would take in water by osmosis, swell, and eventually rupture (lyse) unless it was in an environment with a balanced solute concentration.
A membrane-bound organelle found in certain single-celled organisms, particularly freshwater protists, that pumps excess water out of the cell.
Contractile vacuole is usually technical/scientific, academic in register.
Contractile vacuole: in British English it is pronounced /kənˌtræk.taɪl ˈvæk.ju.əʊl/, and in American English it is pronounced /kənˌtræk.təl ˈvæk.ju.oʊl/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine a tiny water balloon (vacuole) inside a cell that can squeeze itself (contract) to squirt out water. Contract + Tile (like a floor tile that gets wet and needs squeezing) + VACUum (sucks up water) + hOLE (where water exits).
Conceptual Metaphor
A bilge pump or a sump pump for a microscopic cell-boat, constantly removing leaked-in water to prevent sinking/flooding (lysis).
Practice
Quiz
What is the primary physiological role of the contractile vacuole?