cardiac cycle: meaning, definition, pronunciation and examples
Low (C2/Technical)Technical, Academic, Medical
Quick answer
What does “cardiac cycle” mean?
The complete sequence of events in the heart from the beginning of one heartbeat to the beginning of the next, encompassing systole (contraction) and diastole (relaxation).
Audio
Pronunciation
Definition
Meaning and Definition
The complete sequence of events in the heart from the beginning of one heartbeat to the beginning of the next, encompassing systole (contraction) and diastole (relaxation).
In medical and physiological contexts, the cardiac cycle refers to the rhythmic, coordinated series of pressure changes, valve movements, blood flow, and electrical activity that constitute a single heartbeat. It can also be used metaphorically to describe any regular, cyclical process fundamental to a system's operation.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling conventions apply to the component words (e.g., British texts may use 'haemodynamic' in descriptions, American 'hemodynamic').
Connotations
Identical technical meaning. In lay contexts, both variants are equally uncommon.
Frequency
Equally frequent in respective technical/medical literature. Extremely rare in general discourse in both regions.
Grammar
How to Use “cardiac cycle” in a Sentence
The cardiac cycle consists of...During the cardiac cycle, ...A single cardiac cycle lasts...Understanding the cardiac cycle is crucial for...Variations in the cardiac cycle can indicate...Vocabulary
Collocations
Examples
Examples of “cardiac cycle” in a Sentence
adjective
British English
- The cardiac-cycle events were recorded.
- A cardiac-cycle analysis was performed.
American English
- The cardiac cycle events were recorded.
- A cardiac cycle analysis was performed.
Usage
Meaning in Context
Academic
Central concept in physiology and medicine. Used in lectures, textbooks, and research on cardiovascular function.
Everyday
Virtually never used. A layperson would say "heartbeat".
Technical
Core terminology in cardiology, medical training, biomedical engineering, and physiology.
Vocabulary
Synonyms of “cardiac cycle”
Neutral
Weak
Vocabulary
Antonyms of “cardiac cycle”
Watch out
Common Mistakes When Using “cardiac cycle”
- Using it as a plural uncountable noun (e.g., 'cardiac cycles are' is correct).
- Confusing it with 'heart rate' (which is the number of cycles per minute).
- Misspelling as 'cardic cycle'.
FAQ
Frequently Asked Questions
No. The pulse is the palpable wave of pressure in the arteries caused by the ejection of blood during the cardiac cycle. The cycle is the cause; the pulse is one effect.
It varies with heart rate. At a typical resting heart rate of 75 beats per minute, one cardiac cycle lasts about 0.8 seconds.
In a healthy heart, no. The electrical depolarisation (seen on an ECG) initiates and coordinates the mechanical events of the cycle.
It is the fundamental mechanism of heart function. Understanding it is crucial for diagnosing heart disorders, interpreting ECGs, and understanding how the cardiovascular system responds to stress, exercise, or disease.
The complete sequence of events in the heart from the beginning of one heartbeat to the beginning of the next, encompassing systole (contraction) and diastole (relaxation).
Cardiac cycle is usually technical, academic, medical in register.
Cardiac cycle: in British English it is pronounced /ˈkɑː.di.æk ˈsaɪ.kəl/, and in American English it is pronounced /ˈkɑːr.di.æk ˈsaɪ.kəl/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of the heart as a two-phase PUMP: Squeeze (systole) to push blood out, then Relax (diastole) to fill up. One SQUEEZE-RELAX = one CARDIAC CYCLE.
Conceptual Metaphor
THE HEART IS AN ENGINE (with intake, compression, power, and exhaust strokes forming its cycle).
Practice
Quiz
What primarily determines the length of a cardiac cycle?