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What is the duration of a single cardiac cycle?
- a)0.5 seconds
- b)0.8 seconds
- c)1.0 seconds
- d)1.5 seconds
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
What is the duration of a single cardiac cycle?a) 0.5 secondsb) 0.8 se...
The duration of a single cardiac cycle is approximately 0.8 seconds in a healthy adult at rest.
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What is the duration of a single cardiac cycle?a) 0.5 secondsb) 0.8 se...
Understanding Cardiac Cycle Duration
The cardiac cycle refers to the sequence of events that occur within the heart during one complete heartbeat. The duration of a single cardiac cycle varies based on factors such as heart rate, but it is typically around 0.8 seconds in a resting adult.
Key Components of the Cardiac Cycle
- Phases of the Cardiac Cycle
Each cycle consists of two main phases: diastole (relaxation) and systole (contraction).
- Diastole: The heart chambers fill with blood.
- Systole: The heart pumps blood out to the body.
- Heart Rate Influence
The duration of the cardiac cycle is inversely related to heart rate. For example:
- At a resting heart rate of about 75 beats per minute, each cardiac cycle lasts approximately 0.8 seconds (60 seconds/75 beats).
- As heart rate increases (e.g., during exercise), the duration of each cycle decreases.
Why Option B is Correct
- Typical Duration
The average duration of 0.8 seconds is based on the average resting heart rate and normal physiological conditions.
- Clinical Relevance
Understanding the duration helps in diagnosing and monitoring various cardiac conditions. A prolonged or shortened cycle might indicate underlying heart issues.
In conclusion, the duration of a single cardiac cycle is approximately 0.8 seconds in a healthy adult at rest, making option 'B' the correct answer.
The cardiac cycle refers to the sequence of events that occur within the heart during one complete heartbeat. The duration of a single cardiac cycle varies based on factors such as heart rate, but it is typically around 0.8 seconds in a resting adult.
Key Components of the Cardiac Cycle
- Phases of the Cardiac Cycle
Each cycle consists of two main phases: diastole (relaxation) and systole (contraction).
- Diastole: The heart chambers fill with blood.
- Systole: The heart pumps blood out to the body.
- Heart Rate Influence
The duration of the cardiac cycle is inversely related to heart rate. For example:
- At a resting heart rate of about 75 beats per minute, each cardiac cycle lasts approximately 0.8 seconds (60 seconds/75 beats).
- As heart rate increases (e.g., during exercise), the duration of each cycle decreases.
Why Option B is Correct
- Typical Duration
The average duration of 0.8 seconds is based on the average resting heart rate and normal physiological conditions.
- Clinical Relevance
Understanding the duration helps in diagnosing and monitoring various cardiac conditions. A prolonged or shortened cycle might indicate underlying heart issues.
In conclusion, the duration of a single cardiac cycle is approximately 0.8 seconds in a healthy adult at rest, making option 'B' the correct answer.
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