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Related Concept Videos

Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac output averages...
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...
Pulse01:05

Pulse

The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls between...
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Exercise and Cardiac Output01:17

Exercise and Cardiac Output

Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be met...
Physiology of the Heart: The Cardiac Cycle01:18

Physiology of the Heart: The Cardiac Cycle

The cardiac cycle describes the events from one heartbeat to the next. It includes three main phases: diastole, atrial systole, and ventricular systole, all driven by changes in chamber pressures and the function of heart valves.
Diastole: The Relaxation Phase
During diastole, all four heart chambers relax. The atrioventricular (AV) valves open, and the semilunar valves close. This phase sees the lowest chamber pressures, promoting ventricular filling. Venous blood enters the heart through the...

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Related Experiment Video

Updated: Jul 2, 2026

Determination of Cardiac Output in a Porcine Model for Ex Vivo Pulmonary Perfusion
06:10

Determination of Cardiac Output in a Porcine Model for Ex Vivo Pulmonary Perfusion

Published on: June 28, 2024

Understanding cardiac output.

Jean-Louis Vincent

    Critical Care (London, England)
    |September 6, 2008
    PubMed
    Summary
    This summary is machine-generated.

    Cardiac output, the heart's blood-pumping rate per minute, depends on heart rate, contractility, preload, and afterload. This article uses a bicycle analogy to clarify how diseases and treatments affect these cardiac output determinants.

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    Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine

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    Last Updated: Jul 2, 2026

    Determination of Cardiac Output in a Porcine Model for Ex Vivo Pulmonary Perfusion
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    Determination of Cardiac Output in a Porcine Model for Ex Vivo Pulmonary Perfusion

    Published on: June 28, 2024

    Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine
    12:37

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    Published on: February 9, 2016

    Area of Science:

    • Cardiology
    • Physiology
    • Hemodynamics

    Background:

    • Cardiac output (CO) represents the volume of blood ejected by the heart per minute.
    • CO is fundamentally determined by four key physiological components: heart rate (HR), contractility, preload, and afterload.
    • Accurate interpretation of CO necessitates a thorough understanding of each determinant's role.

    Discussion:

    • This article employs a bicycle speed analogy to elucidate the complex interplay of factors influencing cardiac output.
    • The analogy simplifies the relationship between heart rate, contractility, preload, and afterload in determining overall cardiac performance.
    • It aims to enhance comprehension of how various pathologies and therapeutic interventions impact these CO determinants.

    Key Insights:

    • The bicycle analogy provides an intuitive framework for understanding cardiac output dynamics.
    • It highlights the independent and combined effects of heart rate, contractility, preload, and afterload on blood circulation.
    • This approach facilitates a clearer grasp of physiological and pathophysiological states affecting the cardiovascular system.

    Outlook:

    • Further application of this analogy may aid in medical education and patient communication regarding cardiovascular health.
    • The simplified model can serve as a basis for exploring more complex hemodynamic concepts.
    • Continued use of such analogies can improve understanding and management of conditions related to cardiac output.